Should able to do it with FI substitution:
Transaction Code: OBBH
1. Create a substitution
2. Create a Step and Define the pre-requisites eg: document type
3. Create the substitution rule. You can create an exit and use it
For more information on creating and maintaining substitutions, see Financial Accounting -> Special Purpose Ledger -> Validations and Substitutions -> Substitutions in the SAP Library.
