How to select multiple ranges for a parameter WITHOUT first filling all other required parameters?

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I'd want to be able to have multiple range selections for "Sales order no."

Problem is: when i press the button marked with green, i get the error "Fill in all required entry fields".

I put my main processing block at the START-OF-SELECTION event.

What to do to not have this happen? It seems to me that i should be able to add multiple selections without all the hassle of first filling every other mandatory field.

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