Solution : https://service.sap.com/sap/support/notes/542191 (SAP Service marketplace login required)
Key words :
ddic changesabap workbench -> ddic objects -> development -> dictionary, enter message class /sapapo/atp_bop, menu option 'goto'-> 'properties', data type '/sapapo/cif_sl_doc_head', data type '/sapapo/cif_sl_doc_head_x', function group '/sapapo/atp_update', message class /sapapo/atp_bop, 'type' reference type, message /sapapo/atp_bop 087, call transaction se91
Related Notes :
| 628948 | Performance of BOP update in APO |
| 543203 | BOP: Status remains 'sent' |
| 375193 | Backorder processing: Composite SAP note on posting |