Weird message: ME022 vendor blocked

Dear MM consultants & users,

I'm trying to create a PO to this vendor but keep on getting error message ME022 "vendor blocked". FYI, this vendor is not blocked for ant Purchasing Organization (checked in XK05).

Is there any method other than XK05 to block/unblock vendor?

Can we block vendor by Account Group?

FYI, the vendor code is 99000418. If I try block this vendor, error message will appear like this "vendor 99000418" blocked". But this error message shows no vendor code - "vendor blocked".

Please assist. Thank you.