Award DFF to be read only and populated with a value

Summary:

I am trying to write a table validation value set to be used on a DFF to populate a read only field with the num defined in another value set. Can we use a bind variable to point to the award number? It is working when pointing to another DFF but having issues pointing to the award number.

Value set: Award to Num

Flex_Value	FFVV.description
Award A	123
Award B	234
Award C	456

Value set: Table Validation AwardNum_View

select substr(FFVV.description ,1,25)

from FND_FLEX_VALUES_VL FFVV

where

value_category = 'Award and Num'
AND FFVV.ENABLED_FLAG = 'Y'