Should Give Error Message

Hi all

Purchasing organization 001 assigned to company code 001,

when user want to create Vendor with P.Org 001 and comapny code 002

the system should give error message

During Vendor creation ,if the wrong purchase organisation is selected, system is allowing to create the vendor master.

Even though ,I have done the Setting in the following , the error message is not reflectiog

1. Message Control for Vendor Master Data

2.T.code : OBMSG

3.T.code : OBA5

Kinldy let me know the steps if possible let me know userexit to solve this......

Thanks & Regards

chand