How to create a simple calculated measure ?

Hello,
I'm having difficulties creating a very simple calculated measure within OBIEE administrator. Let's say I have a dimension "product" with attribute "product price" and a measure "sales count". I'm trying to define in the "Business Model" layer the calculated measure "total sales". In order to do that I defined it as as a Logical Column with expression "product price" * "sales count".
However OBIEE doesn't compute what I'm expecting, it does in fact a cartesian product of the products and the grand total sales, which doesn't make sense. To alleviate that I tried to define the measure as associated to the Product level, then I get the computations right but the sales by product are not summed into a grand total.
Anyway this seems like a very basic thing to do but I've not been able to find any documentation about it; the internal "Help" documentation is extremely limited. Is there another source of documentation that I'm not aware of ?
Thanks for your help,
Chris

Hi there again,
I'm coming back to you regarding the calculated measure above. As advised, I defined it using physical columns and am - almost - able to get the correct results. However I notice that the measure is not correctly aggregated over the "product" dimension. More specifically what happens is that the products are organized into a level-based hierarchy; only the leaf elements have an attibute "price"; the upper nodes in the hierarchy group different products together with different prices.
The "total price" measure for such a node should be the sum of "product price" * "sales count" for all underneath nodes in the hierarchy, which is the way it is done for instance in AWM. However with the measure defined as above, I only get NULL values for upper nodes, due to the fact that "product price" is NULL for those levels and thus yields a NULL result.
I've tried to circumvent the problem by associating the measure to the leaf level of the "product" hierarchy in the Properties -> Levels tab, however this doesn't seem to do what I want, it only forces the computation to happen at the lowest level of the hierarchy. What I would like is for the measure to aggregate to upper levels just as it would were it defined directly in AWM.
Do you know how to do that ?
Thanks for your help!
Chris

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