Project ID and Source Project ID in the Material Transaction

We are using third party tool to integrate the data for Miscellaneous transaction to ebs. Found that the third party system updating bo the the Project Id and Source Project Id with same data.

Based on Oracle doc (Doc ID 445049.1) - Cost collection program interprets that no transfer is required  as both Project_id and source_project_id, and task_id and source_task_id are populated with the same data.

I just want to know when or what Transaction Type i should populate data for both the Project ID and Source Project Id with same data or when i should populate data to only source project id and not the project id so that Cost collection can transfer the cost.