Different invoicing party & planned in purchase order &

What causes this issue?

You entered a goods invoice with delivery costs.
In purchase order &V2&, the invoicing party is &V1&. You are now
posting the invoice to &V3&. This can be for one of two reasons:
You entered &V2& in the field <LS>Purchase order</> and &V3& in the
field <LS>Invoicing party</>.
You entered a multiple allocation. The first item refers to a purchase
order with invoicing party &V3&. Another item refers to purchase order
&V2&. The system copies the invoicing party from the first item to all
items, in this case &V3&.
INCLUDE MM_IV_MELDUNGEN OBJECT DOKU ID TX

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 your entries and make any necessary corrections.
If you want to prevent items with different invoicing parties from
being selected, change the system message to <LB>E</> in Customizing.
To do this, you work through the step <LS>Define Attributes of System
Messages</> in the Implementation Guide for <LS>Invoice Verification
</>.
The message is set as a warning in the standard system. In this case,
all items are selected.

Error message extract from SAP system. Copyright SAP SE.