Determinations and Timepoints

Hello Colleagues,

if I create a determination on ROOT_TEXT (Structure /BOFU/S_SHORT_TEXT) and I add a class to set the upper case text field it works fine. I am not sure about the Evaluation Timepoints. If I set it to "During Save (Before Writing Data)" I get an "Determination pattern not supported" error. If I set it to "Before Save (Finalize)" I don´t get the error.

What is the difference of these two timepoints and which one would be the correct one in my case.

The examples in BOPF always use "During Save (Before Writing Data)" but have the same error at check I have.

Any glue for this?

Thanks for your answers.

Best regards

Roman