Solution : https://service.sap.com/sap/support/notes/338778 (SAP Service marketplace login required)
Key words :
additional key words aposfc, function module co_xt_order_create andco_xt_order_create_from_plord, import parameter i_priority, reference type coxt_priority, select fields optional, source code corrections, planned order conversion, production order, process order, order priority
Related Notes :
456776 | R/3-APO: Order priority for internal production orders |