Solution : https://service.sap.com/sap/support/notes/880557 (SAP Service marketplace login required)
Key words : 
respective direct preceding documents, open credit values, multiple open credit, open delivering credit, prerequisites scheduling agreements, mais scheduling agreement, scheduling agreement, scheduling agreements, terms mais, open deliveries
Related Notes : 
       
| 1130017 | |
| 890550 | |
| 128207 | Open dely credit vals too high for compon.suppliers |