List differences error

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Hi folks,

I have 2 tables. month and Customer. I need this list: customer’s didn’t pay months.
I have true value in test part, but in screen is not the same output.

As the [Ref0DEME][Dönem] is already a list, the SPLIT() should not be needed. Try just with [virGesmisDonemler] - [Ref0DEME][Dönem]

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