https://userapps.support.sap.com/sap/support/knowledge/en/2038708
2038708 - ME21N: Net price needs to be entered twice - SAP ERP & SAP S/4 HANA | SAP Knowledge Base...
When creating a purchase order in transaction ME21N, the net price (PBXX) is manually entered. After pressing enter, the price is deleted and message 06218...