Solution : https://service.sap.com/sap/support/notes/408550 (SAP Service marketplace login required)
Key words : 
subcontract orders             0 pc    external deliveries, sc requisitions                0 pc    requirements, subcontracting stock monitoring list, 0 pc    external deliveries, open gi                            0 pc, archiving object mm_spstock, 'higher-level lines', 0 pc    deliveries, stock monitoring, list generated
Related Notes : 
       
| 458938 | FAQ: Subcontracting stock monitoring list, transaction ME2O |