Value constraints are usually associated with a simple type; they refine a simple type by defining limits on the values which the simple type can represent. To set the value constraints associated with a simple type:
Switch to the Enterprise Service Tools perspective.
Ensure that the Outline view is visible in the Enterprise Service Tools perspective of the workbench. If the Outline view is not visible, from the workbench menu, click .
Set the value constraints for the selected simple type by making the appropriate changes to the information shown in the Details pane.