Solution : https://service.sap.com/sap/support/notes/1224661 (SAP Service marketplace login required)
Key words : 
srm-ebp-con reason, attached advance correction manually, terms large number, distribution lines takes, large number, distribution lines, distribution screen, match locations, support package, performance issues
Related Notes : 
       
| 1169088 | SRM 6.0 Performance Guide |