line type is "Service billed by amount", the invoice does not validate receipt

Summary:

We created an invoice from a PO that includes lines originating from a PR with the line type "Service billed by amount". The invoice match option is set to Order, and the PO match type is configured as 3-way. However, the invoice proceeds to payment without being placed on hold, even though no receipt has been created for the PO. It seems the system is not validating the receipt despite the 3-way match setup.

Is it standard behavior that when the line type is "Service billed by amount", the invoice does not validate the receipt, regardless of whether the match option is set to 2-way or 3-way?