Replacing Business Objects - Modelling Issue

I'm working on a large 'BI' project that is replacing Business Objects with OBIEE ( actually its not really a BI project its more of a give us what we've got now using OBIEE project ) - which is proving challenging in some areas.
One example is with the Data Model that BO provides in its Universe, the model I'm replacing is pretty much 3NF (even though it uses DIM and FACT in the table names) they're joined pretty much all over the place, which enables the users to select from tables which can be 4,5,6 steps away from the original - including via M:M relationships!
Anyway one specific issue is based around the old question of multiple fact tables where not all dimensions are conformed.
Dim - Business Manager ---< Fact - Forecast >----- Dim - Product -----< Fact - Actuals >------ Dim Salesman
I've setup the Dimensions for each Dimension Logical Table.
I've created a single logical table containing a Forecast and Actual Amount from the 2 fact tables and set the logical levels appropriately at Table Level. For the Forecast measure I have a logical level set to 'Total - Salesman' and for the Actuals measure I have logical level set to 'Total - Business Manager'.
This works great when I select an Attribute from Business Manager, and Salesman and both of the measures in the Answer.
However the users want to be able to select from Business Manager, and Salesman dimensions without selecting the measures, is this possible - do I need to add a bridging table to resolve the relationships between a Business Manager and Salesman explicitly rather than implicitly via the facts?
I have set Implict Fact at the Presentation Model, however this doesn't work (it misses off Total Level aggregation in the OBI Server SQL).
Thanks in advance for any suggestions/answers.

Thanks for the helpful reply Turribeach, along with the interesting and informative link.
This is my first foray into the world of BO and I think some of the points you make in the link are right on the money. I've spent many years working with Oracle Tools (Dataquery,Data Browser, Discoverer and then OBIEE when Oracle acquired the tool ). There are difficulties in the modeling with OBIEE, certainly when it comes to trying to replicate a 'fairly' complex BO universe they become apparent.
Many hoops to jump through to give the user a like for like, which I'm not convinced will be possible - maybe some negotiation is required :-)

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For architechturel guidelines you can go [through thii doc|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/00caf8bd-487a-2a10-36a9-93d840309310].
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[This document|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f0d97ec6-5de0-2a10-a5b3-b5926075566c], you can use as an example
[CE 7.1 Tuorial Center.|https://www.sdn.sap.com/irj/sdn/nw-development?rid=/webcontent/uuid/903c2cdb-98d6-2a10-84b7-ab22535de11a]
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Please see the following post:
Business Objects Enterprise 3.1 Licensing
Tim says:
names means you can have five users created, any amount logged on concurently (i.e the administrator could have 10 sessions, usera 20 etc no limit) But you can only create 5 different users names
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Replacing Business Objects - Modelling Issue

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