The order of validation rules determine the order in which they are run and shown on an asset page.
Important 
                                                
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Prerequisites
You have a global role with the Product Rights > System administration global permission.
Steps
- Open the asset type.
- In the left pane, click the assignment containing the validation rules you want to reorder, and then click Validation rules.
- Above the table, to the right, click Edit.
- Drag  to the required position. to the required position.
- Click Reorder Validation Rules.
 The Reorder Validation Rules dialog box appears.
- Drag to the required position. 
- Click Save.