Solution : https://service.sap.com/sap/support/notes/655313 (SAP Service marketplace login required)
Key words : 
cumulative received quantity, me38 solution implement, post return deliveries, return deliveries, inbound deliveries, adjust crq', schedule lines, terms borgr, correction instructions, indicator '
Related Notes : 
       
| 666773 | |
| 664361 | ME88: Agreed cumulative quantity is too small |