Managing batch numbers requires high level of accuracy consistency and planning. Especially if you manage the serial or batch number cost by Serial/Batch Valuation Method. In such case, receiving inventory into the same batch more than once means that items for the same batch can be received with different costs. This may complicate the tracking of batch costs, and cause revaluations with postings to different accounts depending on outgoing batch transactions. To prevent this issue and enable easier cost control, SAP Business One enables you to block multiple receipt to the same batch:
When selected, it is impossible to draw A/P reserve invoice for a batch into a good receipt PO more than once.