Return Vendor setup in Vendor Master

Hi All

User creating a new vendor in company code 1000. when he check the "Return Vendor" system should create a custmoer as background process.

But system issuing an error message that user not authorized to company code 2000.

Why system is checking for company code 2000?

He has authorization for only company code 1000. He is creating vendor in 1000 company code.

Please suggest me, i am using transaction code MK01

THanks

SUNIL AKURATI