The internal invoicing transactions control the process of the invoicing program. The external transactions that you defined are allocated to the internal transactions in Customizing.

The main and subtransaction fulfill the following functions:

• You document which aspect of the business transaction or business process forms the basis of the posting of the posting item.
• Each main and subtransaction is allocated an explanatory text that you can use for correspondence.
• The main and subtransaction influence automatic account determination.

The subtransactions supplied from billing are used for the revenue account determination.
Normally the detailing is not required after these subtransactions for the business partner items. Therefore, they are replaced in invoicing by summarization transactions, in order to optimize the number of business partner items.

The following internal main and subtransactions are available in invoicing: