Preparing Data Objects for Completeness Check 
You use this procedure to identify and prepare data objects for completeness check.
You have identified and enabled data objects to participate in data completeness check.
More information:Configuring Generic Data Orchestration Engine Settings:
In the parent data object, create a custom service.
More information: Custom Service
Use appropriate Completeness Check APIs in the custom service.
More information: Using the Completeness Check APIs in the Parent Data Object
In the Flow Definition of the parent data object, insert the custom service created above, after a call to CDS_SERVICE.
More information:Adding a Custom Service to a Flow Blueprint
Recommendation
For data updates from the back-end or the client insert the custom service in the MMW_FLOW_INBOUND_BACKEND or MMW_FLOW_INBOUND_CLIENT_AV flow definition respectively.
In the child data object, create a custom service.
More information:Custom Service
Use appropriate Completeness Check APIs in the custom service.
More information: Using the Completeness Check APIs in the Child Data Object
In the Flow Definition of child data object, insert the custom service created above, after a call to CDS_SERVICE.
More information:
Adding a Custom Service to a Flow Blueprint
Recommendation
For data updates from the back-end or the client insert the custom service in MMW_FLOW_INBOUND_BACKEND or MMW_FLOW_INBOUND_CLIENT_AV flow definition respectively.