How to initialise a DB dataset entirely from code?

SvipSvip
edited 5:10PM in FastReport 4.0
I can get it to work when I create it from the form, but I wish to be able to change the stored procedure called (and its parameters) based on input from the user.

Yet, I keep getting errors like this:
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Error
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The following error(s) have occured:

Memo6: Could not convert variant of type (Null) into type (Double)

Unknown variable or datafield: rep008."HwId"

Unknown variable or datafield: rep008."SrchKey"

Unknown variable or datafield: rep008."SysTm"

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Where rep008 is the name of the stored procedure and ."X" are of course values returned by this stored procedure.

I am unable to find some specifics on how this is done entirely from code.

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