Program Behind Medium 7- Special Function in Output Determination for LD00 and RD00 in SD Module

Hi Experts,

We are in process of making some change in the Outputs in Sales and Distribution Module.

Business wants that when Ba00 is triggered it should go to multiple receiptants.

For that we know we have a Output medium which is 7 Simple Email and its respective program is RSNASTSO and the form is SAPOFFICE_AUFRUF_VX.

But we want the same functionality on Delivery Output which is LD00 and Billing Output RD00.

Can anyone tell me the SAP Standard programs behind it so that we can use? We tried to search that on SAP Platform but was only able to find for Ba00.

Thank you