Error when searching Serial Number Details

Hi Experts,

I am getting this error when searching for Serial Numbers :

[Microsoft][SQL Server Native Client 10.0] [SQL Server] The text, ntext, and image data types cannot be compared or sorted, except when using IS NULL or LIKE operator. 'Serial Numbers Master data' (OSRN) (OSRN)

Please can someone guide me how to fix this since I cannot change the design of the OSRN table.

Thanks in advance,

Greeshma