Order management transactions directly posted to GL

Hi,

We have a requirement as below:

The Internal Customers are defined in Customer Master with Account type as Internal.

Transactions are performed between customers of different Operating Units.

Now when creating Sales Order against these customers,  we want to Post the transactions directly to GL.

We do not want it to be interfaced to AR and make an Invoice.

Kindly let us know the process or workarounds for this process.

Regards,

Gulnar