Avoid over-constraining a model by removing constraints that are not required. 
-  Select a dimension. 
- Do any of the following: - Click a lock to unlock it. 
- Click the EQ symbol to remove an equality constraint. The EQ symbol appears with a slash through it when the equality constraint is not applied. 
- Delete the dimension that corresponds to the constraint. A warning appears that you are not deleting the actual constraint. Click Unconstrain in the warning dialog to remove the constraint.