Column 'X' in table 'Y' cannot be found or may not be used in this expression.

The column or table name is wrong, was renamed or deleted, or isn't valid in this context.

Why it happens

• A typo, or a column that was renamed or removed in the model.
• Referencing a measure as if it were a column (or vice versa).
• Using a column from a table that isn't in scope for the expression.

How to fix it

1. Check the exact name and fully qualify it as Table[Column].
2. If it's a measure, reference it as [Measure] with no table prefix.
3. After a rename, recreate the reference; refresh the fields list so IntelliSense is current.