Siebel product Configuration : Product Quantity Validation

Hi All, I have encountered one issue while building the validation on product quantity on eConfig. Kindly suggest me the solution Scenario : Throw error when user downgrade the quantity of a line item on econfig page. Example : I have an asset with child asset item quantity 5 and in modification order I am reducing it to 3 on customization. I should throw error as soon as user downgrades the quantity. Solution I tried : I have written the product script on Cfg_ChildItemChanged method as below. Code is working absolutely well, only the issue I am facing is that