Different invoicing party &1 planned for document &2

What causes this issue?

Document &V2& comes from SAP Transportation Management (SAP TM).
You entered an invoice with reference to TM documents.
In TM document &V2&, invoicing party &V1& is entered. You are now
posting the invoice to the invoicing party &V3&.
This can be due to one of two reasons:
You have entered the invoicing party &V3& and TM document &V2&.
You entered a multiple assignment. The first item refers to a TM
document with invoicing party &V3&. Another item refers to TM document
&V2&. The system copies the invoicing party from the first item to all
items, in this case &V3&.

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.
By default, this message is set as a warning. In this case, all items
are selected.
If you want to prevent items with a different invoicing party being
selected, set the system message as an error (<LB>E</>) in Customizing
for <LS>Logistics Invoice Verification</> under
<DS:SIMG.SIMG_CFMENUOLMROMRM>Define Attributes of System Messages</>.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.