Administration > Working with the Type and Attribute Management Utility > Managing Types > Attribute Information Page > Constraints Tab > Enabling and Disabling a Constraint
  
Enabling and Disabling a Constraint
To enable a constraint, select the checkbox in the Enable? column for that constraint. To disable a constraint, clear the checkbox.
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Only New and Inherited constraints can be disabled. Modeled constraints cannot be disabled.
If multiple constraints are added to an attribute, then the attribute values must satisfy all of the enabled constraints on that attribute.