Alternative reconciliation account

Hi,

we have a following requirement from the client:

The business process is the following:

approx.10.000 Retail beer customers in dist. channel X and Y. We would like to invoice a so-called rent fee with sundry invoicing for the equipments they use. (In the future we will create other kind of sundry invoices for them too.) Depending on the category of the equipment we will invoice 3 different amounts per equipment.

These customers will issue towards us an invoice with the same amount as a marketing contribution.

Incoming and outgoing invoices have to be settled against each other. This is not a onetime action. We must repeat this process year by year.

Business process:

1. Outgoing invoices have to be created for customers about the annual rent fee

2. Mass creation of sales orders and invoices using LSMW.

3. Customer issues an incoming invoice in the same value about marketing cost contribution ( with LSMW for FB01 transaction ).

4. Outgoing and incoming invoices have to be settled (zero settlement)

4. If customer doesnu2019t issues invoice, he has to be dunned

My questions are:

1) our client has asked to Make settings for u201CPosting with alternative reconciliation accountu201D: allow for G/L account ABC to post with alternative reconciliation account Nr. DEF.

we can not change the recon. account to alternative recon. account here, when the customer invoices are get created from VF01, so what is the purpose of alternative recon. account here ?

2) How to carry out Automatic Zero settlement of incoming and outgoing invoices using automatic payment program?

Thanks,

Vidya