Solution : https://service.sap.com/sap/support/notes/176766 (SAP Service marketplace login required)
Key words :
additional key words saplcois, sales order processing, export parameter av_qty_plt, atp quantity, list display, plant selection, component check, plant level, bapi bapi_material_availability, item level
Related Notes :
177233 | Lock records in ATP display not taken into account |
165038 | Incorrect cumulative ATP quantity on item overview |