Interfacing billing without extended line totals

Summary:

Would like to interface quantity only for autoinvoice import without extended amount

Content (please ensure you mask any confidential information):

Looking for a way to load autoinvoice interface file with just quantity and unit of measure, and have the system calculate the line amount using memo line rates that are already in the system. It appears that the line amount is a required field for the interface file. Is there a way around this without additional licenses for Order management or other non-ERP services?

Version (include the version you are using, if applicable):

24B

Code Snippet (add any code snippets that support your topic, if applicable):