Cannot perform post with clearing in F-51

Hi All,

My user use F-51 to do post with clearing transaction. But prompt: "Ex.rate diff. accts are incomplete for account a/c: 15001002 currency RMB" after click post. This error come in PRD evironment, but not in DEV. Could you advice if any of our FI configure / master data are missing or incorrect? Thanks!

The setting of OBA1 in our DEV and PRD system is currently the same. But do I need to add GL: 15001002 in OBA1 to solve problem?

I find exchange rate difference transaction in DEV but without error and could be post in F-51

PRD also has this exchange rate difference account, but PRD has error after post in F-51.

Rdgs,
Emily