How to turn off the default enablement of prorate across all line items option for IDR invoices

Summary:

Content (please ensure you mask any confidential information): How to turn off the option prorate across all line items which is selected by default and greyed out, for IDR invoices. We have a situation where the POs do not have the freight line items, but the invoices are set to recognize the freight. In cases, where the freight is recognized, the option 'prorate across all line items' is selected by default and greyed out. This is ending up in a manual effort of cancelling and recreating lines or invoices. We do not want the default enablement of this option and