Solution : https://service.sap.com/sap/support/notes/128207 (SAP Service marketplace login required)
Key words : 
additional key words s066-olikw, start program rvkred77, open delivery values, attached advance correction, open delivery credit, actual scheduling agreement, open delivery, program error, scheduling agreement, credit-relevant
Related Notes : 
       
| 880557 | RVKRED77 + sched agr w/ rel order: mult value of delvy goods | 
| 135922 | Sales document: Statistics structures are not filled | 
| 129470 | Incoming orders for component suppliers: Alternative update | 
| 128217 | Incorrect open dely value after delivery deletion | 
| 126768 | SIS:Open ord.qty in comp.suppl.schedg.agrm. incorr. |