Hi Martin,
Please check the following posts -
http://scn.sap.com/thread/3359502
http://help.sap.com/saphelp_srm70/helpdata/en/46/d7a0fbca8e0e5de10000000a1553f7/content.htm
http://scn.sap.com/thread/454642
http://scn.sap.com/thread/2051849
https://scn.sap.com/thread/1839123
https://scn.sap.com/thread/3196132
http://scn.sap.com/thread/3179703
Thanks,
From RBEI,
Snehal