How to dynamically map COA segment values based on source data in FAH

Summary:

My source line from third party application is populating GL natural account values which is exactly matching my GL natural account COA values. I want to dynamically map it without any mapping set input/output values. I try to map it by defining segment level account rules and mentioning the source in the account rule which has the COA natural account value but it didn't work and the accounting is being errored out (screenshot attached).

Please mention how can I achieve this?

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