Is deriving or check Change Request attributes in DERIVE_ENTITY or CHECK_ENTITY

Hi,

I'd have a requirement to derive or check  the Change Request attributes like Change Request Reason and Change Request Priority , e.g if CR Priority is empty, set to a specific value or Check if Change Request Reason is set.

I know via an OSS message that we are not able to derive or check CR attributes using BRF+ but can we derive or check using the BADI?