Hi Sankar, By looking at your issue, It seems number range has been maintained in such a way where MM Document number = FI Document number where in FI External number range is maintained for RE document type. If this is the case, first check whether Document mentioned above is already generated in FI.(check in FB03) or it is already available in MM.(check in MIR4) By comparing the Number range of FI and MM you can get an idea in which number range problem exists. Then go to that respective internal and change the completed number range by one number so that this mismatch can be set right. But before changing ensure that above said pre-requisites are met. Regards Karthikeyan G
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