How to change Relationship within one Measure

[JānisB]

I have dimension table dim_Account_Resource_CostItem (picture 1)

I have fact table Budget (picture 2)

The realtionship between these tables (picture 3)

I have a Matrix report (picture 4)
Rows:
1.Resource
2.CostItem

The report uses measure Budget CP:

Budget CP = 
    SWITCH(TRUE(),
    ISINSCOPE(dim_Account_Resource_CostItem[Account_ID]), BLANK(),
    SUM('Budget'[Value])
    )

The problem is that for Resources "Laboratory", "Tractors" and "Water" it shows one value 600 summarized by CostItem not separated by Resources.

It's understandable why.
The question is - how to change the measure Budget CP or how to make additional changes to get the result -
If Resource in ("CostOfMaterial", "CostOfServices") then use relationship by ItemCost, but if Resource in ("Laboratory", "Tractors", "Water") then use use relationship by Resource between dim_Account_Resource_CostItem table and Budget table?

The result should be:

Link to pbix file 'Razosana_v3.0_MODEL - EXAMPLE.pbix' for download:

https://failiem.lv/u/u679acqvrr 

[Rupak_bi]

plz share sample data

[JānisB]

The link to example pbix file in the main topic.