Solution : https://service.sap.com/sap/support/notes/135922 (SAP Service marketplace login required)
Key words : 
apply hot package 40b/10, additional key words mais, deliver sales documents, error getwa_not_assigned occurs, attached program correction, program error, correction instruction, program lmcs5f10, program lmcs5u04, delivery orders
Related Notes : 
       
| 204130 | SIS update: Collective note | 
| 158357 | Deliveries: GETWA_NOT_ASSIGNED, OLFMNG not filled | 
| 128207 | Open dely credit vals too high for compon.suppliers | 
| 127235 | Delry service for component supplier MCVBEL-VSMNG_L | 
| 125700 | MCVBEL-VSMNG_L and MCVBEL-VSWRT_L not filled |