Hi Stefan,
did you check the code list mapping for MeasureUnitCode?
And if you created a mapping there did you did it by standard upload?
If yes, please be sure that they are available in the 'Quanitites and Units of Measure' in the fine tuning (if they are not you see that there is no description in the code list mapping - MeasureUnit)
I'm asking because TIME and ZPC are both no standard UoM therefore you have to maintain them in C4C.
If you still have problems perhaps you can provide a picture of the code list mapping and the payload.
Regards,
Raphael