I receive the following error when trying to create an invoice: The total net amount invoiced exceeds limit

This error can occur if your customer has the transaction rule Allow net amount to exceed subtotals disabled, and you have already invoiced the total amount of the order.

Contact your customer directly to request the ability to exceed the subtotal or have the PO amount increased.

SAP Business Network for Procurement & Supply Chain > Transaction Documents > Transaction (Invoicing)