Cross company payment

Dear Gurus,

I need one clarification regarding inter company payment.

1. My company code(1700) taking all invoices from c.code (1100) behalf of other vendors. It means all vendors they are sending invoices to 1100 c.code

At that time 1100 c.code passing entry.

01   Customer account(1700)  dr

31       to Vendor account            cr

In 1700 c.code books entry

  40  Expenses account dr

  31     to Vendor(1100) account  cr

Now, my question is Holding company code(1000)  is paying to 1100 c.code behalf of 1700.  

How we can clear in 1700 company code  liability(1100).and what is the entry?

Could you please advise me on this?

Regards,

Viswanadh