Solution : https://service.sap.com/sap/support/notes/600410 (SAP Service marketplace login required)
Key words : 
transation 'enter invoice/credit memo' activity 'display/edit invoice/credit memo' -, transation 'confirm goods/services' activity 'display/edit confirmation' -, activity 'confirm goods receipt/enter service', activity 'enter invoice/credit memo, transaction 'enter invoice/credit memo', transation 'confirm goods/services', transation 'edit bid invitation' -, goods receipt confirmations/confirmation, transation 'edit purchase orders' -, transation 'edit auction' -
Related Notes : 
       
| 877076 | Translation problems with generated screens | 
| 728912 | Short dump when generating the screens for the search | 
| 649122 | Entry of customer fields only of upper cases possible | 
| 637606 | User-defined fields in the search results | 
| 632982 | Generation of the screens for the sourcing | 
| 632691 | Untranslated texts in generated screens | 
| 618400 | Support Package 01 for SRM 3.0 |