How I can do to set payment on behalf for TRM financial transactions, paying through F111

Dear colleagues,

I would like to pay by payment on behalf in TRM transactions, which the payment order payed by transaction F111.

In TRM  I do not work with vendors and clients, I work with company code and BP and I do not know how to do it.

I already have changed the customizing banks through FBZP.

Could you help me please?

Thanks

Regards