Disallow duplicate items on lines when creating a sales order

Summary:

The business needs to avoid adding two identical items when creating a sales order and displaying a duplicate item message that this item has already been entered.

We have been reviewing the possibility of creating this through an extension, performing this validation of active articles and that they are the same item, despite the fact that the extension is configured, it continues to allow adding the same item in the order lines.

Content (required):

Go through the document attach the view the extension configured.

 import oracle.apps.scm.doo.common.extensions.ValidationException;

import oracle.apps.scm.doo.common.extensions.Message;