Ability to select 'attribute_number' DFF as source in user-defined formulas

Summary:

Ability to use values in attribute_number DFFs as a source in user-defined formulas for SLA. For example PO Schedule attribute_number1

Content (please ensure you mask any confidential information):

We seem to be limited to character DFFs as a source when trying to create user-defined formulas in Receipt Accounting. We need to use value in attribute_number DFFs. Is this not available? Or is there some way to add this type os DFF as a source?

I know we could use a character DFF and some function like 'To integer', but it is not exactly user friendly and we already have all data in the existing DFF.