User getting error while running an inquiry on Microsoft Dynamics GP

One of our users receives an error message in Microsoft Dynamics GP while trying to do “receivables transaction inquiry”.
Details:
This happens only for this one user and in this one company; when I tried logging in using different user accounts, I found no errors. So when this user goes to run a "receivables transaction inquiry by customer" and enters the customer digit and then tabs out to see the, results they receive this error:
[Microsoft][SQL Native Client][SQL Server]Cannot insert the value NULL into column 'ORTRXAMT',table 'tempdb.dbo.##1760642', column does not allow nulls. INSERT fails.
So now I need a solution to get rid of this typical problem.
Thanks.
