jamesfredley opened a new pull request, #16720:
URL: https://github.com/apache/grails-core/pull/16720

   Fixes #16713.
   
   An enum `unique` group that included a multi-column association asked for 
one column name and threw `Cannot treat multi-column property as a 
single-column property` at startup. Each configured column of the group member 
is now added to the unique key. A property with no explicit columns keeps the 
previous fallback.
   


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