strange error using value prompt

[Desperado]

Hi , i'm creating  a  value prompt . but i'm getting a strange error ....
the prompt was created on receivable type column which is a char field ...
I just seleccted the column , from the list and built the prompt page . when i run the report , i got this error.

RQP-DEF-0177

An error occurred while performing operation 'sqlOpenResult' status='-28'.

it's working for every other query item ....
I'm getting this error for this item only.

Can anyone tell me y i'm getting this error and how to solve it ....

Thanks in advance

[Desperado]

Okay , i fuigure it out ... it's some oracle error .. I'm in hte process of solving it .