Release 10.1A: OpenEdge Development:
ADM Reference

ContainedDataObjects

List of the handles of the Data Objects contained in this container object.

Data type: CHARACTER

Notes:

Read and Write
The container class uses this property to keep track of the data objects for the stateless server side.
The SmartBusinessObject (SBO) class uses this property on both the client and server for most logic and at design time to get names and column lists from the individual data objects.