Problems when saving rules with "SELECT VALUES" from itemlist

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Hi everyone!

I was just evaluating the latest version (2021.1.3.163) on our DEV system, and wanted to prepare new functions for my processes.

I had issues when trying to save a rule that included the new "select values" function to check if a collection of values from an item list is not empty.

In the testing window the rule works as expected, it just wont let me save it because of invalid rule configuration. As soon as i remove select values and replace it with something else it works.

Is this a bug or am I doing something wrong? I can't say much about earlier versions, but i think it worked in the previous one (143).

Can anyone help?

Thanks!
Christian