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Filter with a 3 tier relationship in CDS

I have 3 related tables in CDS using a canvas app as a front end


Project related to multiple tasks 

Each task related to multiple subtasks. 

The table are related using 1-M relationship lookup fields 


I want to run a report on all my subtasks. 


When i try to Filter using subtask to get to my task i am fine, 


But when i try to filter from my subtask and try to reach project attribute it says that its not supported. 


So i am trying to do 


"Subtask.taksrelID = task.ID and Task.relProjid = Project.ID "


If this is not supported - then i am not sure how to proceed to read data from my project when i searching through my subtasks. 


any help appreciated. 

Dual Super User II
Dual Super User II

Hi @altafr 


Can you try to implement the below expression:


Subtask.taksrelID = task.ID and LookUp(TaskDataSource, taskIDColumn = Subtask.taksrelID).relProjid = Project.ID 


Here, you need to replace TaskDataSource with the name of datasource for tasks and taskIDColumn with the uniquie identifier of the datasource. You will need to add TaskDataSource in the datasource list.



Hope this Helps!


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