can calculated key figure be derived from a custom table

Question: Hi fans,
I would like to have a calculated kf values based on certain entries in the custom table. How can I achive.

Thanks,

Answer:
my dear... calculated key figures (in BEx) can only be derived from InfoObjects in your InfoCube...

Answer:
thanks el Belgio, I think I have not asked the right question -

what I am looking for is -
I would like to have a query with 'discount price' as a key figure. This key figure is not available in the cube and the discount price is derived from
no of items (field available in the cube) * unit discount price (available in custom table ).
In order to use virtual key figure, the doc says I need to create a key figure?. Since these calculations are only for this query and are dynamic, can I use any existing 'amount' field which is already existing and which is not used in this query.

Thanks,
gene

Answer:
actually... you could pick up your "unit discount price" in a start routine...

my suggestion: add a field to your InfoCube; use a start routine to pick up the extra field(s); do your calculation in the update rule of the new field

cheers,

El Belgio
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