Solution : https://service.sap.com/sap/support/notes/205362 (SAP Service marketplace login required)
Key words : 
symptom abap/4 runtime error message_type_x, additional key words iw38, purchase requisition number remains, indicator collective preq, purchase requisition number, pm / cs order, preq purchase requisition, purchase requisition, order type, technical completion
Related Notes : 
       
| 645081 | |
| 372544 | Termination 00055 when resetting technical completion |