RFBIKR00 - Update vendor master

Hi experts,

I have created a few vendors only using the General data from LFA1.

Now I want to update those vendors using RFBIKR00 with the Company Code data (LFB1).

As the vendor doesn't exist for my company code, I have to use XK01.

But when I want to create the batch input, I got this error:

Acct already exists; general area not being processed

But that's wrong! Doing it manually (XK01, ...) everything's working.

What am I doing wrong?

Thanks

Michael