Hello Ani,
no luck with OSS notes, our efforts are going towards filling the business area values for the first company code, nowadays the settings allow blanks for some accounts in one company code, and then, is when the wrong filling happens. So it would be a way to avoid future errors..
I better explain, our case happens when the lines that belong to one company code, let´s say: CC A100, allow the BusArea to remain blank(status field and validation is allowing blank)(for the entire CC A100 part of the document)
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Then, when posting the second company code (B100) lines, those accounts have the Business Area field mandatory, so, people can´t let them remain blank.
At document posting time, the system fills up Business Area field for CC A100 with the values from CC B100, (and at that point, the validation is not triggered anymore, so it can be posted.
If all business area fields have "values" other than blank, the system respect those.
The error presented at the moment when people wanted to reverse the posting, validations work normally and the combination is not correct, so they can´t go any further.
The temporary solution for the reversing has been to remove the account from validations sets, in order to have the reverse posting on the same bussines areas the original document did.
I´m asking permission to report the problem on the OSS, but that needs some internal approval process here.
Also, here postings are made through F-02.
Best of luck,
Best regards,
Ana Arriaga