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I am trying to create an external lookup between a file I have loaded into Monarch and a excel .xlsx file. Once I go through the process of creating the lookup and I get to the screen where you add the linking columns assignment, the field that I need to select from the file that is already in Monarch does not appear in the list under Table Window Column. The column is clearly visible in Monarch, but not when I need to select it to create the link.
I have created external lookups many times before and never had this problem. What is causing this problem? I am using Monarch v 11.6.