Add SeriesDate to SeriesDescription with Importconverter?

I use autopush on XVI from Electa Linacs to store all Cone Beam CT's of daily Patient Setup in our Conquest Server.
In the next step all CT's should be moved to the hospital pacs. But the result of a Query from hospital pacs will be a list with StudyDate of the CT used for planning and many Series of CBCT with the same StudyDate. It is not possible to detect a CBCT with a specific SeriesDate.
My Question: how combine the existing SeriesDescription with prefixed SeriesDate?
I had no success with my tests:
ImportServer0 = set 0008,103e to "%V0008,0021"+"%V0008,103e"
ImportServer0 = set 0008,103e to "%V0008,0021 %V0008,103e"
Is it possible to combine Tags without Lua?
Thanks

Thank you Marcel
it works fine.
Excuse me for wasting your time. It was definitely a writing error in my tests.
Hubert