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LSMW - Field already in use

Hi experts

I am creating an LSMW for TCode FBB1 (entering some transactions in group currency only to correct some foreign currency rate related errors). The problem I am facing is when I go to step 3 (Maintain Source Fields) and try to complete this step, it gives me errors for those fields which are repeating

for example (Name 'NEWBS' already in use. Choose another name). This is so because I have some fields like Posting Keys, GL account and Amount on the debit side as well as the credit side and it is marking the credit side items as "already in use" because these are also appearing on the debit side.

Can I get some guidance on how to deal with this issue. I explored SCN before posting this question and some people have suggested to change the field name. I want to know exactly in which step I should change the field name appearing for the second time and how.

Any comments/ suggestions would be greatly helpful.

Thanks for your time.

Moazzam

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