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Good morning! Super then, everything works fine! Thank you so much for helping!  Have a nice August!    Best,    Stella

Hello again! My problem is finally solved,. Actually the "ΣQ"s vars where not the problem, but a duplicate name in variables as you mentioned above. I just want to ask, if there is a warning "const...

Thank you for your prompt response. Actually I do have variables called using Greek letters (for example Σ for SUMs). Before I change the naming, I have only one question more. This feature exists ...