Auto clearing of bank open items via MT940 statements

Hi

I am currently working on a project for Electronic bank statement automation in SAP via MT940 , the idea is to automate bank statement upload via swift and then auto clear the entries into AR/ AP / General ledgers

I am struggling to find an efficient way to establish the existing GL mappings and BC codes used in current bank format which can then be used to link with Mt940 formats , please can some one help and share experience

regards

rinki