thanks for replying me. actually, it is to prevent user from other dept to change the PO even print/message. when i check inside authorization the configuration is only for their own dept by putting dept code at pur org field of change. but still can change. it is because of the me22 layout screen?
Sorry, but I never used that object. My first guess would be that one is for clsical change of document and the other for change history. But as I said, this is just a guess.
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