Solution : https://service.sap.com/sap/support/notes/388015 (SAP Service marketplace login required)
Key words : 
system calls function module me_requisition_ext, system issues error message 00055, additional key words bapi_salesorder_change, function module me_requisition_ext, setting parameter i_bapi_call, solution parameter i_bapi_call, attached program correction, distribution document, -party items, required fields
Related Notes : 
       
| 400242 | PReq delivery date with complete delivery: no update | 
| 119803 | Error in SD BAPIs for third-party order processing |