Best practice in typical modeling case ?

Hello experts
Please, advise, how to optimize my current approach of implementation of HANA model for the following typical task.
My case:
I need to build a CalcView with MATERIAL as an input parameter, that will return all the BILLING ITEMs for the bills that contain this material.
BUT! The selection of the proper BILLING ITEMs result table should be done by an already existing graphical CalcView [gcv_BILLS].
Current implementation approach steps:
Choose all the unique Document_IDs for bills containing the materials from the input variable
Inner-join the unique Document_IDs with the results of CalcView [gcv_BILLS].
where
Further transformations (out of current question)
Trouble:
I hoped that the list of unique Document_IDs could be passed by HANA as an initial filter into the CalcView [gcv_BILLS]…it didn’t. It is seen in PlanViz that CalcView [gcv_BILLS] selects all the billing data and only afterwards during inner-join step the unwanted bill data is filtered out.
Note: In the given CalcView [gcv_BILLS] the Document_ID attribute is mapped from the top of the model to the bottom - to all the underlying bw-DSO tables containing raw data, so that filter variable on Document_ID attribute of CalcView [gcv_BILLS] works fine.
Question:
How to make HANA push down the set of unique Document_IDs (selected on step 1) to CalcView [gcv_BILLS] as an initial filter?
What should I do or how should I rebuild the model? Maybe the whole approach should be reviewed.
Any ideas are appreciated

Hello Gaia,
If yo have 3 landscape, backend connection should be like this.
SRM DEV   - ERP DEV
SRM QAS   - ERP QAS
SRM PRD - ERP PRD
If you have 2 landscape.
SRM(client 100) - ERP DEV
SRM(client 200) - ERP QAS
SRM PRD         - ERP PRD
Regards,
Masa

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