There seems to be some confusion on various blogs about the difference between the PM10000 table which is the PM Transaction Work File and is part of the PM Transaction Logical group when you run check-links.
The PM00400 table is the PM Keys Master. The PM00400 table is part of the PM Keys Master Logical group. There is a separate blog post on this site on how to correct errors in the PM00400 table.
This might be a typical error related to the PM Keys Master. This error was from the Payables Transaction Inquiry by Document screen