Error msg"Enter relevant working time attributes" and disappering work cent

Hello,

I am using ESS for time recording within a cProject scenario.

When I want to record time and click on refresh appears an error message saying that I have to "Enter relevant working time attributes" and the work cent disappears.

In the configuration of the time record profile there is no field defined as a "must" field and I have no glue which field there has to be filled because the error message is really general.

Has someone an idea what I could do? I am using ESS 600 SP 13 Patch 6.

Thx and have a nice day, Vanessa

P.S. Sorry for crossposting this with thread Error msg"Enter relevant working time attributes" and disappering work cent, but there is no answer yet and maybe this is the better forum for this question.