Update 'instruction key' field in F110 proposal based on conditions

Dear Friends

We have a business scenario wherein, we need to update some Hardcoded values in Instruction key field of F110 payment proposal and payment document, based on some conditions in the underlying invoice documents.

I checked various user exits, BTEs and BAdIs. And I believe "FI_F110_SCHEDULE_JOB" is the best solution.

Can someone validate my approach and guide me accordingly.

Thanks

Srini