Packing slip on Classic Receipt Page - only available for QTY PO Line Type

Summary:

Packing slip on Classic Receipt Page - only available for QTY PO Line Type

Content (please ensure you mask any confidential information):

Hi - this question relates to the Classic Create Receipts page, rather than the Redwood receipting pages.

When creating a receipt for a PO Line Type of e.g. "Goods billed by quantity", the Packing Slip field is visible:

However, it is not visible for line types of "Services Billed By Amount":

Is there any way around that?

It might not be possible, based on a previous question on Customer Connect (Enabling packing slip field on receipt screen to capture it during receipt for fixed price PO lines