Two physical logical source formulas for on logical column

I have two fact tables :
1. W_SERVICE_REQ_F(opened_dt_wid, assigned_dt_wid, closed_dt_wid, QUEUE_WID, SERVICE_REQ_WID): grain is one row per service request
2. W_SERVICE_REQ_DAY_A(DATE_WID, QUEUE_WID, NUM_OPENED, NUM_CLOSED, num_assigned)
The goal is to answer NUM_OPENED, NUM_CLOSED per queue in a day and be able to drill-down to those service requests.
Physical model:
Common_Date.row_wid = W_SERVICE_REQ_F (Opened_Dt).opened_dt_wid
Common_Date.row_wid = W_SERVICE_REQ_F (Closed_Dt).closed_dt_wid
Common_Date.row_wid = W_SERVICE_REQ_DAY_A.DATE_WID
Queue_d.row_wid = W_SERVICE_REQ_F.QUEUE_WID
Queue._drow_wid = W_SERVICE_REQ_DAY_A.QUEUE_WID
Service_req_d.row_wid = W_SERVICE_REQ_F.SERVICE_REQ_WID. (there is no join between Queue_d and Service_req_d)
BMM Fact and LTSs:
I have W_SERVICE_REQ_DAY_A, W_SERVICE_REQ_F (Opened_Dt), W_SERVICE_REQ_F (Closed_Dt) as LTSs of "Fact - Service Request" in that order.
BMM Fact logical columns (measures):
# Closed
# Opened
Question:
I want to configure each of the above logical column with two physical columns of different aggregate forumlas. (to ensure queries that dont need service req number hit a table) (similar to http://www.gerardnico.com/wiki/dat/obiee/fragmentationlevel_based).
SUM(W_SERVICE_REQ_DAY_A.NUM_CLOSED)
COUNT("W_SERVICE_REQ_F (Closed_Dt)".SERVICE_REQ_WID)
Can someone help in configuring one logical column with two physical column sources with different aggregate formulas?
This is what I tried:
In # Opened Properites->Data Type, mapped it to both W_SERVICE_REQ_F (Closed_Dt).ROW_WID and W_SERVICE_REQ_DAY_A.NUM_CLOSED
In # Opened Properties->Aggregation tab, selected 'Default aggregation rule' as Count Distinct. In the bottom, Logical table sources override as follows:
W_SERVICE_REQ_DAY_A : SUM("Fact - Service Request"."# Closed")
W_SERVICE_REQ_F : COUNT("Fact - Service Request"."# Closed")
Should it be done in a different way?
PS: OBIEE 10.1.3.4.
added OBIEE version: Feb 3, 2012 4:40 PM

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