You can set the property InsertAllowed = False in the page extension of the Customer List page. Additionally, you can place an error in the OnInsertRecord() trigger within the Customer table extension to prevent record creation.
With these conditions in place, no customer can be inserted directly from the page. However, if you add the validation at the table level, you can still allow specific users (e.g., with admin rights in the User Setup) to create customers.
From a business perspective, this ensures that only a designated person is responsible for creating new customers.
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