Cannot use DSUB function in Business Logic Callable Object

Hi sdners! I am trying to create a Business Logic Callable Object, that compares a date and actual date. I used DSUB like this:
DSUB(DVAL(DSTR(NOW(),'DATE')),DVAL(DSTR(@beginning_date,'DATE')),'D')
@beginning_date is of type Date. DSUB should return how many days passed between actual date and @beginning_date. However, when I test it using Test tab, it returns 0 (zero). I tried using this also with same result:
DSUB(NOW(),@beginning_date,'D')
DSUB(NOW(),@beginning_date,'DD')
DSUB(@beginning_date,NOW(),'D')
DSUB(DVAL(DSTR(NOW(),'DATE')),DVAL(DSTR(@beginning_date,'DATE')),'DD')
DSUB('5/05/2009','1/20/2009','D')
DSUB(5/05/2009,1/20/2009,'D')
Does anyone know what should I do to get it solved??
Any help is highly appreciated!
Regards,
Fede

Hi,
I have the similar issue.
In my case it is taking too much time for completion.
It is a background step so it should execute automatically.
I have also checked Queue's for this.
But could not understand why it is taking soo much time?
Regards,
Pratik

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