Solution : https://service.sap.com/sap/support/notes/140298 (SAP Service marketplace login required)
Key words : 
confirm stock removal transfer orders, additional key words rv_xvbapf_create, function module rv_delivery_create, internal table fxvbapf, sales orders, mass creation, transaction vl04, transaction lt12, solution make, special information
Related Notes : 
       
| 154091 | Performance in delivery process: Collective note | 
| 140346 | Performance of mass creation delivery (FXVBEP) | 
| 139346 | Performance improv VL04 from stock transport order | 
| 127134 | Document flow performance, file VBFA (sales) |