SAP Note 26629 - Duplicate invoice not checking across companies

Symptom:

According to warning M8108, duplicate invoice checking is based on vendor, document date, reference document no., $ and currency.
However the system does not check across companies, even though it is
the same vendor, in both invoice verification (warning M8108) and
accounts payable (warning F5117).

Cause and prerequisites

Documentation is incorrect.

Solution
The duplicate invoice check is based on company also. In the
documentation of message M8108, 'Company' should be included as one of
the fields involved in the duplicate check (change via transaction SE61)

Additional key words

FB01 MRHR MR01 SAPMF05A SAPMM08R MM08RI10 DUPLICATE_INVOICE
SAPFF001 DOPPELTE_BELEGE_PRUEFEN F5117 M8108