Avoid creating linked dimensions to a source that contains UnaryOperatorColumns, CustomRollupColumns, or CustomRollupPropertiesColumns calculations
This rule analyzes database dimensions to determine whether a linked dimension is based on a dimension that contains unary operators or custom rollups.
Best Practices Recommendations
For best performance, you should avoid linking to dimensions that contain custom rollups or unary operators.
For More Information
For more information about linked dimensions, see Using Linked Objects in a Cube.