Check the validity of your model after schema changes, and before
      generating schema templates, code, or a physical model.You can check the validity of a model
      at any time.
- (Optional) Select diagrams for the schema you want to
               validate.
- Choose  (F4).
- In the Options tab of Check Model Parameters, expand the containers and  choose validation checks. The  Options tab lists checks to be performed with symbols
                  indicating their severity. - Do not disable any
                        ESP-specific checks. 
- (Default and recommended) Disable Existence of
                           relationship or entity link under
                           Entity.
 
 
- In the Selection tab, navigate to the
                  ESP Schemas subtab and select schema definitions
               to check:- Select or unselect check boxes.
- Choose a named selection.
- If you selected schema in your diagram before starting the model check, you
                  can select them for checking by clicking Use Graphical
                     Selection ( ) in the Selection tab toolbar. ) in the Selection tab toolbar.
 
- Choose OK.
Next
Review results in the 
Check Model subtab in the status bar. It lists the checks made, and any errors or warnings. 
Correct any errors. No automatic corrections are provided.