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Defining the Item Structure 
The item structure is used in the GetDetail BAPI wrapper.

If the synchronization type of the SyncBO is Upload (U01), the mapping defines the item structure for creating a BAPI wrapper.
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1. Start transaction merep_sbuilder.
2. Enter the SyncBO ID.
3.
Choose
Edit.
Alternatively, you can choose
Mapping and go to the SyncBO Builder:Mapping
Setting screen by double-clicking on one of the red texts Import or
Tables under the GetDetail BAPI wrapper
name. Then choose
Display <-> Change.
4. On the Tables tab page, select Map to define the client view of the item structure for each table parameter.
5. On the Tables tab page, select Key to define the R/3 key fields for the item structure.

Each item must be uniquely identified by the key field(s).

If the type of a key field is NOT NUMC, the Map flag is automatically set and the checkbox is grayed out. This is because the field value is defined externally (for example, by a client application) when an item is created. If the type is NUMC, however, you only set a flag in the Map column if the field is to be visible to clients. When you create an item, the field value is automatically assigned by Smart Synchronization, regardless of what value is defined by a client application. Numbering begins with 1, and the increment is +1 (that is, 1, 2, 3…).
6. Perform the steps described in Defining SyncBO Relationships to define any fields containing a key field value of another SyncBO on the Tables tab page.
