Problem with gen_row_num_by_group() function.

Hi ,

My input data like this

DOCUMENTNO_YEAR

11000000022008

11000000022008

11000017042010

11000017042010

I am using the gen_row_num_by_group() function to generate the unique values for the each group.

in my query my function like this

gen_row_num_by_group(QT_GET.DocumentNo_Year)

then i am getting output like this

DOCUMENTNO_YEAR     OCCURANCE

11000000022008     1

11000000022008     2

11000017042010     1

11000017042010     1

i checked the length of the input also all are length 14 only . but i dont know why gen_row_num_by_group() function giving the wrong result.

Is it is any bug ?

Please help me in the solution .

Thanks&Regards,

Ramana