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Loading, Displaying, and Deleting
Metadata 
IDoc (Intermediate Document) metadata comprises structures for the corresponding IDoc types that are required by the IDoc adapter to convert these IDocs to IDoc XML format and the other way around.
Using an RFC connection, metadata of this type can be either called directly at runtime or loaded to the Integration Server beforehand.
The system containing the metadata is either the sender or receiver SAP system or, if the sender or receiver system is a subsystem, the SAP reference system where the metadata is saved.
You can display metadata that has already been loaded, or if you are upgrading the application system then you can delete the metadata and reload it.
To access the metadata in the sender system, you must establish an RFC connection to this system using the port maintenance in the IDoc adapter.
...
1. To find out what metadata has already been loaded, call the transaction Metadata Overview for IDoc Adapter (IDX2).
The system
displays a screen with the directory of all systems connected with the IDoc
adapter (including a description) for which metadata has already been loaded.
Choose Port Maintenance in IDoc Adapter (
) to call the corresponding transaction and to create additional
ports.
2. Expand the individual systems to display the IDoc types and clients including a description for each system. The system displays the metadata for each connected system for which metadata has already been loaded.
3.
To
apply the metadata structure loaded from a particular system to another system
(for example, to an SAP reference system), select the link to the
corresponding IDoc type and choose Copy (
).
The system displays a dialog box in which you can copy the IDoc type description to another system (Target Port).
4.
To
delete metadata that has already been loaded, select the link to the
corresponding IDoc type and choose Delete (
).
The system asks you if you really want to delete the selected structure.
5. To delete the metadata structure, choose Yes.
6.
To
load additional metadata, choose Create (
).
The system displays a dialog box where you can enter the IDoc Type including Extension and the system (Source Port).
7. Make the required entries and choose Continue.
The new structure is inserted in the tree structure as follows:
¡ If the structure originates from a system from which metadata has already been loaded, it is inserted below the structures already loaded from this system.
¡ If the structure originates from a system from which no metadata has already been loaded, it is inserted together with the system below the already listed systems.
8.
To
display details about a metadata structure that has already been loaded,
choose the link to the corresponding IDoc type. To display this structure in
detail, choose Display (
). The system displays the structure in a
hierarchy tree.
9.
To
display the corresponding system (port) and the basic
type from the detailed display, choose Header
Information (
).
10.
To
display the segment versions of all segment types in the structure, choose
All Segment Versions (
).
11. Select a segment to display all its fields.