From a logical view, there might be not the one and only solution. 1. Concerns might be about the consistency of numbering. In case of several MES software products (maybe also from different software vendors) integrated to SAP ERP the integrity (number uniqueness) needs to be ensured. a) organizational: you need to define unique number ranges for each MES (plants…) software b) technical: can every MES system "customize" the range and maybe c) does the field length harmonize ? 2. If you do not want to manage the criteria in 1), then you might go with SAP ERP internal number assignment. You transfer the MES external batch number and an external system ID (MES) to SAP ERP, into an additional field.
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