Unable to use project header dff as accounting source

Summary:

We have a requirement to derive one of the COA segments using a value on the project header DFF.

We created a mapping set for where we used the project dff as input source.

However, when we try to use this on Procurement TAD, it throws an exception that "

The account definition ****_YYY_ZZZ uses the source Project Descriptive Flexfield Attribute 13 that isn't assigned to account type Charge Account."

Any idea how to get this resolved?

Is there a way to add the project dff to the account type Charge account? or an alternative to how can we use project header dff as an accounting source in procurement.