In the IMG activity Specify Shipping Units, you have defined the required shipping units (for example, C4 envelope, C6 envelope).

In the IMG activity Assign Shipping Units, at least one shipping unit must be assigned to each communication type. If required, you can also assign a shipping unit in accordance with the initiator, the business process, and the recipient country.

You define the capacity of the shipping unit (number of pages or bytes) in the IMG activity Specify Shipping Units.

In the IMG activity Assign Templates: Cover Sheets/Acknowledgements of Receipt you define the keys for the document templates in accordance with the shipping reason. You can also assign the keys in accordance with the initiator and the country.

In addition, you must have set the indicators for the cover sheet and the acknowledgement of receipt in the IMG activity Specify Shipping Reasons.

In the IMG activity Manage User Exits, one of two user exits of user exit category SRE_DIST is provided: EHS_PACK_B (for bytes) or EHS_PACK_P (for pages). Depending on the communication type, the shipping orders are packed according to bytes or pages.

In the IMG activity Assign Names for User Exits, the user exits EHS_PACK_B or EHS_PACK_P are assigned to the exit category PACKAGE in accordance with the communication type. The exit category PACKAGE defines the point in the program at which the user exits are called.