Thanks for the hint. Somehow I must have missed something before because i tried that too (on global/project level). But now I was able to overwrite the properties:
11:33:13,343 INFO [AbstractTestPropertyHolderWsdlModelItem] Overriding 36 properties [..]
To load the values this way may be another possibility for me now.
On the other hand I have more possibilities and flexibility using my small script if it comes to load only some values (e.g. with specific prefixes) or want to have them on special testcases only or if I have the same names for testcases in different test suites. I gonna have to work this out now which way will be best for my project.
Thanks again for your help!
