Update CDS documentation to clarify expected rate value 'sign' (+/-) for each RateType

[af-stayorgo]

Description

The CDS documentation should be updated to clarify the expected rate value 'sign' (+/-) for each lendingRateType and depositRateType.

NOTE: the issue of which sign to use (+/-) was previously raised and resolved as part of DP306.

Intention and Value of Change

We are seeing some confusion across the industry regarding the expected 'sign' (+/-) that should be used for rate values associated with certain lendingRateTypes and depositRateTypes. For example, some data holders are using a negative sign for rates associated with the DISCOUNT lendingRateType, rather than the expected positive sign.

The consequences of this confusion are serious, specifically, its leading to errors in interest rates. Errors in interest rates make the data unusable, and if used risk misleading consumers.

Area Affected

The CDS documentation should be updated to clarify the expected rate value sign.

Change Proposed

Update the CDS documentation as follows:

• Product & Account Components section should be updated to clarify the expected rate value sign for each lendingRateType and depositRateType, in particular, the DISCOUNT, PENALTY and BONUS adjustment types.
• BankingProductLendingRate section should refer to the documentation about rate value sign.
• BankingProductDepositRate section should refer to the documentation about rate value sign.