Not sure why you'd need a "program" (standalone program, I assume?) for that. Might want to provide more details on what you're trying to achieve exactly and provide the business requirements as well. Also add FI tag to make sure you're not reinventing the wheel for something that can be achieved with configuration.
This SAP Help was the first hit in Google search, it mentions some BADIs. Take a look, there could be further documentation for those in SPRO in your system.
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