When using the DAX function "RELATED" to add a new column from an Imported table to a DirectQuery table, I receive an error. This error does not occur if both tables are using DirectQuery.
Column: SampleColumn = RELATED(ImportTable[Column])
Error: "The column 'ImportTable[Column]' either doesn't exist or doesn't have a relationship to any table available in the current context."
Relationship: DirectQueryTable[SampleKey] (many) has a relationship with ImportTable[SampleKey] (one)
Cardinality = Many to One (*:1)
Cross filter direction = Both
Make this relationship active = Checked
Note: When creating the column using "RELATED" in the DirectQueryTable table, ImportTable shows up as a suggestion.