Questions on OBIEE reporting against transactional Database

Hello guys
I have a situation where I have to bring in 5 tables from transactional database to do reporting on.. I looked at the tables, there are not typically dimension or fact tables. Each table contains information very specifically, at the same time all tables have numeric values that needed to be aggregated at the lowest level of that table..
I can join all these 5 tables together knowing the key columns. However, this is basically joining 5 tables with fact measures... Since this is transactional database which we don't own, so I can't create views nor changing the table structures..
I wonder how would I be able to configure such model in OBIEE?
Any thoughts?

Thank you for the reply..
The specific situation I have here is:
I have 4 tables that I am polling directly from the4 store's cash register (Oh yea, real real time), they are customer, receipt line, receipt header, inventory,
The physical join is: they are customer-----> receipt line<-----receipt header <------------inventory...
In the BMM layer, each of these 4 tables have columns that should be measures, such as customer.customer credit limit, receipt line. quantity, receipt header. reciept tendered, inventory.quantity on hand... They are more measure columns from each table, but I am just listing one from each..
In this case if i set the aggregation rule on each column, then the BMM model won't a star schema anymore because every table can be fact..
I thought about adding all the measure columns into 1 logical fact table, which then the logical fact will have 4 LTS: customer, Re Line, Re Header, Inv.. This will be fine if I am only dealing with 1 store... However, in reality there will be 50 stores with the same exact tables/structures but on different servesr. Therefore, the logical fact will end up with 4*50 = 200 LTS each has fragmentation defined "store number = NYC or something else"..
Just wondering if combining all the measures in one logical table is the only way to model this design or not? What would be the best thing to do if in this situation I have to report against multiple data source of the same tables in 1 subject area?
Please let me know your thoughts..
Thank you

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