I have a problem in getting the handle of a DDO, which is NOT in the DDO-tree of the Main_File.
Both files are completely unrelated, but I need to save records in the other file, when changes of my main_file are made.

Data_Set and Which_Data_Set return a 0

Are there any workarounds to solve this problem? I couldn't imgagine, that I am the only one. who has this problem.