Thanks, FlameRetired!
- Are the ranges of lstPlanningID and lstContactID next to each other? No, they are in different sheets.
- Are they the same size? No, the first one is around 12 rows and the second one around 5000.
- How are those ranges defined? Are they absolute ... dynamic named ranges ... mixed? They are dynamic lists as they are built from defined tables. In the Name Manager these are their expressions: lstContactID=bdContacts[ContactID] and lstPlanningID=tblPlanningIDs[PlanningID]
- Other issues unforeseen.
I came up with this validation data sentence to look up the entry in both lists:
=IFERROR(IF(MATCH(B22;lstContactID;0);TRUE;IF(MATCH(B22;lstPlanningID;0);TRUE;FALSE));FALSE)
It seems to be working but now I have to change some INDEX&MATCH formulas that were using this code to lookup in both tables.
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