Direct Mapping is possible when the structures are on (1) the root level, (2) the first level, and (3) if they're on the same level on both sides. If structures differ, the SAP Application Interface Framework needs to know how a structure in the message can be reached.

To map structures that are not on the root or the first level, some additional customizing steps are necessary.
This is also true for the mapping of structures that are on a different level in the source or destination structures.

Structures that are not on the root or first level:
You cannot map structures directly when they are on the second level or deeper in a structure.
Structures that are on different level in the source or destination structure:
- You cannot map structures directly when the items are on a level under the header item in the source structure, but the header and items are on the same level in the destination structure.
- You cannot map structures directly when the header and items are on the same level in the source structure, but the items are on a level under the header items in the destination structure.