> ## 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.

# UnderlyingDescription

The **UnderlyingDescription** store contains the description of the [tranche](../data-model-core/tranche).

The following table lists the fields in the store that are used for the CSR Sec non-CTP risk-class.
See the [UnderlyingDescription](../../../../../../datastore/standardisedapproach/underlying-desc) store documentation for details on the store.

| Data Model Field | Store Field | Notes             |
| ---------------- | ----------- | ----------------- |
| As-Of Date       | AsOfDate    |                   |
| Tranche Name     | Underlying  |                   |
| Risk Class       | RiskClass   | “CSR Sec non-CTP” |
| Bucket           | Bucket      |                   |
| Credit Quality   | CSRQuality  |                   |
| Sector           | CSRSector   |                   |
| Pool             | Pool        |                   |
| Attachment       | Attachment  |                   |
| Detachment       | Detachment  |                   |