measure group feature

I miss a "measure group" feacture - like SQL Server Analytics Service has.

It work like following:

Think of having a cube "Gerneral Ledger" with a measure "budget amount" and "actual amount".
the budget and actual amount will be stored in two different views: fact_general_ledger_posted and fact_general_ledger_budget. For boat i will create a measure group. So the cube will look like this:

• Cube General Ledger
  • Dimension Account
  • Dimension Posting Date
  • Measure Group Posted
    • Measure Actual Amount
  • Measure Group Budget
    • Measure Budget Amount

Now i want to have two budgets, so i need a new dimension "budget" where i can choose which budget is shown. This new dimension will only be linked to the measure group Budget, but not to the Posted measure group. So when I filter for f.e. budget "MyLowBudget", the filtering does only affect to the measure "Budget Amount", but not to the measure "Budget Amount".

Currently i can build a cube and link both fact tables with union:

CREATE VIEW fact_general_ledger AS
SELECT * FROM fact_general_ledger_posted
UNION ALL
SELECT * FROM fact_general_ledger_budget

But that will only work when all fact views use the same dimensions...

Here is an example what a complex cube might look (shows a lot of measure groups):

[Stiivi]

Thank you for good specification of the useful feature. This is definitely one of those that we want to have implemented. Requires good design first.

Related feature: #273