SSAS cube query doesn't return same results as an AX view used in cube's perspectives

Hello guys, 

I'm quite new to SSAS and I may be missing something very trivial, but the issue I have is that unlike the it's using, my cube returns kind of grouped results. For example, if I want to see what items does BOM consist of in a view that I created I can see it fine, like this: 

BOM	LineNum		ItemId	
BOM1	1		Item1
BOM1	2		Item2
BOM1	3		Item3

I could use that in SSRS report without any problems. But after using those dimensions (BOM, LineNum, ItemId) to create a query in a cube I only get one line per BOM returned, liko so (mind you that's not even the first line):

BOM	LineNum		ItemId	
BOM1	2		Item2

It looks like there is some sort of grouping going on behind the scenes or something else I'm not aware of, so my question is how to get all the items in the BOM or what should I look into to solve the problem (wrong view, wrong cube query?)

Thank you!