Solution : https://service.sap.com/sap/support/notes/507026 (SAP Service marketplace login required)
Key words :
assigned sales order, process order reason, attached program corrections, assembly order, program termination, production order, goods receipt, call configuration, exception not_convertable, module co_zf_order_unit_conversion
Related Notes :
174988 | Technical note: CO_ZF_ORDER_UNIT_CONVERSION |
173069 | Incorrect conversion between order header units |