Intercompany Posting

HI SPecialist

How can I do the following posting?

1 company code ( ex. 1000 ) and Vendor 5000

2 company code (ex. 2000 ) and Vendor 5001

Then I would like create the following document:

(21) 30.000 5000 (a) (31) 5001 30.000

IT means that I would like create a debit posting in one vendor for one company code and create a credit in another vendor in another company code.

Please could you advice?

Thank you