> ## 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.

# Tranche overrides

Download sample file: [Tranche\_Overrides.csv](../assets/csv/Tranche_Overrides.csv)

This Tranche Overrides file type is identified using the pattern: **\*\*/Tranche\_Overrides\*.csv** (as specified by drc.tranche.overrides.file-pattern). This file is loaded using the **TrancheOverrides** topic. See the [Topic Aliases table](../dev/dev-ref-impl/dev-dlc/dlc-frtb-config#topic-aliases) for an understanding of the topic aliases associated with each topic.

|               |         |          |                   |                                                                                                                                                                                                                                              |                   |
| ------------- | ------- | -------- | ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------- |
| **Field**     | **Key** | **Null** | **FieldType**     | **Description**                                                                                                                                                                                                                              | **Example**       |
| Tranche       | Y       | N        | String            | The name of the tranche to override. Matches the “Underlying” column in the [DRC Trade Level](./sa-drc-trade) file                                                                                                                           |                   |
| RiskClass     | Y       | N        | String            | Set to “DRC Sec non-CTP”.                                                                                                                                                                                                                    | “DRC Sec non-CTP” |
| Parameter Set | Y       | N        | String            | The parameter set for which the override applies.                                                                                                                                                                                            | CRR2              |
| Bucket        | N       | Y        | String            | Tranche Bucket \[MAR22.31].                                                                                                                                                                                                                  |                   |
| Seniority     | N       | Y        | String            | Seniority of the exposure. This is “senior” or not for calculating the SEC-ERBA risk-weights. Replaces the Seniority in the [DRC Trade Level](./sa-drc-trade) file.                                                                          | senior            |
| Rating        | N       | Y        | String            | The rating used when looking up SEC-ERBA risk-weights. Replaces the Rating in the [DRC Trade Level](./sa-drc-trade) file.                                                                                                                    |                   |
| Rating type   | N       | Y        | String            | The rating type used when looking up SEC-ERBA risk-weights (and when applying flooring logic). Replaces the Rating Type in the [DRC Trade Level](./sa-drc-trade) file.                                                                       | STC               |
| Region        | N       | Y        | String            | Region for Bucket [MAR22.31(2)(b)](https://www.bis.org/basel_framework/chapter/MAR/22.htm?inforce=20230101\&published=20200327#paragraph_MAR_22_20230101_22_31). Replaces the Region in the [DRC Trade Level](./sa-drc-trade) file.          |                   |
| AssetClass    | N       | Y        | String            | Asset class for Bucket [MAR22.31(2)(b)](https://www.bis.org/basel_framework/chapter/MAR/22.htm?inforce=20230101\&published=20200327#paragraph_MAR_22_20230101_22_31). Replaces the AssetClass in the [DRC Trade Level](./sa-drc-trade) file. |                   |
| Attachment    | N       | Y        | Double            | Attachment point (Decimal values are expected). Replaces the Attachment in the [DRC Trade Level](./sa-drc-trade) file.                                                                                                                       |                   |
| Detachment    | N       | Y        | Double            | Detachment point (Decimal values are expected). Replaces the Detachment in the [DRC Trade Level](./sa-drc-trade) file.                                                                                                                       |                   |
| Risk Weight   | N       | Y        | Double            | Override the risk-weight for this obligor, instead of looking up the risk-weight by rating. Replaces the Risk Weight in the [DRC Trade Level](./sa-drc-trade) file.                                                                          |                   |
| AsOfDate      | Y       | N        | Date ‘YYYY-MM-DD’ | Timestamp (at close of business) for the data.                                                                                                                                                                                               |                   |