... and having just re-read it would appear the issue is not related to the Validation at all ... that said I would still advocate the above over the existing as I think it's far simpler and importantly the addition of KEY column to Data sheet is what will resolve your fundamental issues...
So continuing from above... on Adjustment Tempo sheet:
The above will return the Unique Key value for chosen property... use this as basis for retrieving all other info as it is a unique value on Data sheet... col AF, eg - let's select "Pending Sale" in D1 and subsequently "19701 Hatton St" as our property given we know 2 records exist...
Using the original MLS# formula:
we know returns the number for the Closed Sale instance irrespective of choice in D1 (ie not the Pending Sale value) ... using our unique value as stored in E1
returns the correct value... the same logic is applied elsewhere...
NOTE: the MATCH of E1 is a repetitive calculation, that is to say the value will be used repeatedly without result altering so rather than recalculating the same value over and over I would advise storing the result of the MATCH in another cell and then referring to said cell in all other calcs (ie calculate only once).
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