Using Crystal Reports XI, and using the command feature with this simple query:
select
Field1 AS Item,
Field2 AS Customer
from
Server.DB.dbo.Table whereField1 = {?Parameter_String}
Returns an error: Conversion of Value overlowed an Int Column.
If the parameter value is one that matches a record, it works.
If the value is hard coded, then zero records are returned and there is no error - it works.
If the parameter value is one where no records match, then the error occurs.
