Hi Syed,
It is a registry key that controls this and the limit is set to 1000 values by default.
Normally, on client machines, registry keys need to be put under the HKEY_CURRENT_USER folder, so go to 'regedit' and browse to this location:
HKEY_CURRENT_USER\Software\Business Objects\Suite 12.0\Crystal Reports\DatabaseOptions
Create a new key called 'LOV' here and then on the right-hand side create a new string value called 'MaxRowsetRecords' with a value higher than 1000, perhaps around 10000 as a start.
If you're using a 64-bit OS, the path you need to browse to is this:
HKEY_LOCAL_MACHINE\Wow6432Node\SAP Business Objects\Suite 12.0\Crystal Reports\DatabaseOptions
Hope this helps!
-Abhilash