Solution : https://service.sap.com/sap/support/notes/337828 (SAP Service marketplace login required)
Key words : 
additional key words rm06ellb, sc stock monitoring list, replenish sc stock, accessing data selection, form routine select_thirdparty_sc_pos, form routine select_deliveries, relevant form routines, executing transaction me2o, stock monitoring, transaction me2o
Related Notes : 
       
| 492911 | ME2O: available SC stock is displayed as 0 at material level | 
| 458938 | FAQ: Subcontracting stock monitoring list, transaction ME2O | 
| 458512 | ME2O Performance during selection via assembly | 
| 360019 | ME2O: Performance during SC Stock Monitoring III | 
| 198835 | ME2O: Performance during SC Stock Monitoring |