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I tried to reverse engineer your matching logic, but I'm not 100% sure with the details you provided. The trick (I think) will be to transpose your Master and join it to the Item Keys by Field/Name and Value. I made a key to see which combinations matched across all code fields.
Everything made sense until I got to item#5 and there were multiple test values under code Z. No products appeared to match CodeA/TestA1 AND Code Z/Tests 3,11, and 9. Is that an OR relationship when the others are an AND relationship?
Let us know if this works foryouor please post more details.
Need help with Lookup - Sample Data attached ddiesel.yxmd