No invoice creation, otherwise item would be entered by the payment run

What causes this issue?

The program does not create an invoice for the current item group
because otherwise the items would be entered by the payment run.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Check that the items for which you want to create an invoice comply with
your selection criteria and the criteria of the invoice type.
Also check whether the items display an incoming payment method. Note
that the incoming payment method can be defined in the contract account
and in the contract object. No invoice is created for items with an
incoming payment method in the standard system.

Procedure for System Administrators

If you want to create an invoice for items with an incoming payment
method, use the function module FMCA_INV_ALL_ITEMS_0600 or a similar
function module for event 0600.

Error message extract from SAP system. Copyright SAP SE.