Hi Sonja,
Error is showing you are not enabled SET_IN_PROCESS_ROOT in SPRO. There is some specify field control Incomplete Customized.
1. Start transaction "SPRO" and open "SAP EHS Management -> Foundation for EHS Management -> Settings for Business Objects -> Specify Field Control"
Check here are SET_IN_PROCESS_ROOT enabled or not.
For more information refer the this SAP Note : Note 1730089 and Note 1769613 .
Let me know the status once you tried
Edward