I have, what I think, is a very simple problem 
I have Parameter 1 that has a series of values (A,B,C) and I want Parameter B to use a specific value based on Parameter 1 (if A, AA; if B, BB, if C,CC). So I have this node that kinda does it manually but I get the dreaded Deferencing non-poiinter

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Any help is much appreciated 
Thanks
EXACTLY what i needed, thanks a million
While the solution provided above should work well irrespective of the number of sheets (provided the lengths of List 1 and List 2 match), the reason for the error in your definition is something else
Ive expanded on that and i want to filter the list of sheets using a parameter but after the List.FilterByBoolMask i get a series of values. How do i get the sheets?
Daniel,
As Vikram shows you above, you are connecting the wrong list into your list.filter. What you are filtering is a list of parameter values not the list of elements. See below.
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PS: Didn’t realize Tim had already made a similar suggestion. Excuse the repetition
God im stupid, thanks a lot to both of you for making me look like an… 
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