Transaction between payment accounts

Hi!

Is it possible to add a transaction between payment accounts? I could not solve the following problem:

We have a reception desk, where there is a main cash (account).
We have 2 waiters who receive the payments from the customerts, both has a cash account. Sometimes during the day they give some cash to the reception desk. BUT guests can also pay at the recepion desk.

My problem is:

1, If every account is payment transaction account, I can not add an account transaction with the same source and target account type. So Waiters can not give cash to recepion.

2, If the reception desk is not a payment account, than I can add the trasaction from waiter accounts, but I can not add a payment button to the payment screen, just under the ticket...

Is there a soultion?

Thanks: Peter