Solution : https://service.sap.com/sap/support/notes/806127 (SAP Service marketplace login required)
Key words :
sap gui start transaction sproxy, /xi/srm/basis/global purchaseorderitem, 'interface objects -> data type enhancements', enterprise buyer professional edition, /xi/srm/basis/global, swap user-defined fields, earlier ebp xml interfaces, select 'data type enhancements ->, srm internal customer fields, /xi/srm/##/global
Related Notes :
| 659386 | PO output in case of customer field changes |
| 494541 | User-defined fields in XML communication |
| 458591 | User-defined fields: Preparation and use |