The common issue what we used to get is to delete the vendor from SRM. SAP has provided with a standard report "BUPA_TEST_DELETE" or you can use Tcode bupa_del by either of them we can delete the vendor from the SRM.
This actually deletes the BP Number form the System. So for example you have a vendor 10001234 and this BP Number also is the same and you don't require this vendor in you SRM System.
Execute the report and input the vendor and uncheck all the Checkboxes which you see on the screen and execute . Once executed the report shows that that particular Vendor is deleted from the system and you can cross check tables like VENMAP and BUT000
