WS20000075 - Error in event receiver

[Márton Zsolt]

Hi All!

Every time, when we are using the standard wf for release of po orders, the wf administrator gets an error message "Mandatory import element 'ReleaseCode' missing" 
The event linkage is not changed, but it is very exasperating to delete every time this message.
The wf is standard, in 4.6c. I've looked on the OSS, but nothing concerning this problem.
Does anybody meet this problem before?
Regards
Zsolt