Aggregate layer mapping

Question

All,
I need help ,
1 have an aggregate table with columns (TotalUnits,ManUnits) with week grain and derived table (TotalUnits,ManUnits) with day grain
I am mapping to fact table having columns
TotalUnits : mapped to LTS derived and aggregate columns directly
AutoUnits : Calculation (TotalUnits-ManUnits) at present using only derived table but in dilema if we could add AGG
ManUnits :mapped to LTS derived and aggregate columns directly
Q1 :- how do i map the aggregate table to Autounits- Calculation (TotalUnits-ManUnits) ?
--adding the calc in the LTS aggregate and setting the content level to week !!!!
Q2 when i map the columns directly for Total and Man for both aggregate and derived i get aggregate as source in the Derived From box in the Logical column properties
is this normal to see the aggregate source as the primary source .

Answer 1

Edited by: Srini VEERAVALLI on Dec 25, 2012 8:27 AMThanks Srini
but i havent understood your point here
-Create measure AutoUnits with expression as TotalUnits-ManUnits and mapping with fact and other one is with Aggtable.
other way is just create another logical measure using existing column in logical fact
When you use these measures with date; fact will be used for other columns agg will be used.
the simpler way to explain is i have to have one logical column which should map derived and agg source
one source for day grain has a calculation and the aggregate has a different calculation
or to put it simply how will you map aggregate source to an existing day grain mapped column where calculation is involved