F110 Payment to vendor with several bank accounts

Hi to all,

I have a vendor with 2 bank accounts, each one for its subisidiaries .

We pay this vendor's head office via transfer and to do so, use transaction F110. Depending on the subsidiary, our vendor wants us to use one account or the other.

All open items go under the head office number, my question is: how do I assign the right bank account to the open items?

I tried with the alternative payer funcionality but did not work.

Can you please help?

Cheers