Is there a way to add a "surcharge line" to an invoice created through pay on receipt autoinvoice

Hi,

we create AP Invoices based on Pay On Receipt.

We'd like to add an additional line to each invoice created through pay on receipt that is a percentage of the invoice net amount. Something similar as a "freight surcharge".

Is there any way to support this? We though about adding a MISC/FREIGHT Line to the ap invoices interface between the pay-on-receipt program and the payables import, but this is an ugly customizations.

Is there any better way to achieve this?

Regards

Johannes