> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Underlying description overrides

Download sample file: [Underlying\_Desc\_Overrides.csv](../assets/csv/Underlying_Desc_Overrides.csv)

This file provides the overrides for SBM Underlying Descriptions.

This Underlying Description Overrides file type is identified using the pattern: **\*\*/Underlying\_Desc\_Overrides\*.csv** (as specified by underlying-desc.overrides.file-pattern). This file is loaded using the **UnderlyingDescriptionOverrides** topic. See the Topic Aliases table for an understanding of the topic aliases associated with each topic.

|                 |         |          |                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                                                               |
| --------------- | ------- | -------- | ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Field**       | **Key** | **Null** | **FieldType**     | **Description**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | **Example**                                                                                                                                                                                                                   |
| Underlying      | Y       | N        | String            | The name of the underlying to override. Matches the “Underlying” column in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.[CSR non-Sec](../interpret-impl/acr/sa/sa-sbm/csr-non-sec): Name of credit issuer., [CSR Sec CTP](../interpret-impl/acr/sa/sa-sbm/csr-sec-ctp): The name underlying the securitisation., [CSR Sec non-CTP](../interpret-impl/acr/sa/sa-sbm/csr-sec-non-ctp): Name of the asset pool and tranche., [Equity](../interpret-impl/acr/sa/sa-sbm/equity): Name of equity issuer., [Commodity](../interpret-impl/acr/sa/sa-sbm/commodity): Name of Commodity. |                                                                                                                                                                                                                               |
| RiskClass       | Y       | N        | String            | Defines the risk class for the underlying.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | “CSR non-Sec”, “CSR Sec non-CTP”, “CSR Sec CTP”, “Equity”, “Commodity”                                                                                                                                                        |
| Parameter Set   | Y       | N        | String            | The parameter set for which the override applies.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | CRR2                                                                                                                                                                                                                          |
| Bucket          | N       | Y        | String            | Bucket number. Replaces the Bucket in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                                                                               |
| CSRQuality      | N       | Y        | String            | CSR only The Issuer or Tranche credit quality. Replaces the CSRQuality in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                                                                                        | IG, HY, NR                                                                                                                                                                                                                    |
| CSRSector       | N       | Y        | String            | CSR only The issuer or securitisation sector. Replaces the CSRSector in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                                                                                          | For CSR non-Sec and CSR Sec CTP, example values: ‘Sovereign’, ‘Financials’, ‘Tech’ ‘Covered Bonds’, ‘Other’For CSR Sec non-CTP, example values: ‘RMBS-Prime’, ‘RMBS-Mid-Prime’, ‘RMBS-Sub-Prime’, ‘CMBS’, ‘ABS-Auto’, ‘Other’ |
| CSRRating       | N       | Y        | String            | CSR non-Sec only Set to “high” for covered bonds with rating AA- or above; otherwise set to “low” or leave blank. Replaces the CSRRating in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                      | “high”, “low”                                                                                                                                                                                                                 |
| EquityMarketCap | N       | Y        | String            | Equity only The equity issuer market cap. Replaces the EquityMarketCap in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                                                                                        | ‘Large’ , ‘Small’, ‘Other’                                                                                                                                                                                                    |
| EquityEconomy   | N       | Y        | String            | Equity only The equity issuer economy. Replaces the EquityEconomy in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                                                                                             | ‘Emerging’, ‘Advanced’, ‘Other’                                                                                                                                                                                               |
| EquitySector    | N       | Y        | String            | Equity only The equity sector. Replaces the EquitySector in the [Delta](./delta-trade), [Vega](./vega-trade), and [Curvature](./curvature-trade) files.                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Example values are: “CSG” “Telecommunications-Industrials” “Basic Materials” “Financials” “Other”                                                                                                                             |
| Pool            | N       | Y        | String            | CSR Sec non-CTP only Pool for tranche. If empty, copied from Underlying.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                                               |
| Attachment      | N       | Y        | Double            | CSR Sec non-CTP only Tranche attachement point. Values between 0.0 and 1.0. If empty, defaults to 0.0.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                               |
| Detachment      | N       | Y        | Double            | CSR Sec non-CTP only Tranche detachment point. Values between 0.0 and 1.0. If empty, defaults to 0.0.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                               |
| AsOfDate        | Y       | N        | Date ‘YYYY-MM-DD’ | Timestamp (at close of business) for the data.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                               |