Warning error when using EnumList + (Ref)

Dear, I am using a column of type EnumList in table (A) and it is referenced to table (B) the employee database, in column of type EnumList I am using the expression right in the option (Suggested values
) in this way TableA [TABLAB] the reference seems to work fine but with a warning according to the image, what am I doing wrong?

this is the configuration in the EnumList column of TableA

Thank you very much for your help!

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