IBM WebSphere Adapters - Manual (Page 113)

Consider the following scenario: Child B1 is in the EIS, but is not in the incoming
structure. Child B1, then, must be deleted. The Command Manager will execute a
Retrieve command to build the structure as it appears in the EIS, then compare
this structure to the incoming object tree. The comparison finds that child B1 is
deleted. Accordingly, the resulting command structure has a Delete command in
that position.
Command Manager Retrieve scenario
Note: This behavior is dependant on the ability of the Command Manager to
determine child keys. Be sure to mark the child key fields in the business object
definition using the appropriate Application Specific Information.
WebSphere Adapter development overview 107