Let us assume you could do this validation.
The user would then probably try to post this as an individual movement by starting MIGO again after the initial movement was posted.
Is that then okay that he references the same reservation?
Or does the user then get a standard error message?
Assuming there is a standard error message, had you already searched for OSS notes, maybe it is just a bug that SAP does not check it within the same document.
Allowed error message types in this method are 'A' termination or 'X' short dump message, use will be very very happy. IMHO you should try another method IMHO. Look for a method where GOITEM-RSNUM/RSPOS are available?
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