string or binary data would be truncated error

Hi There is a " string or binary data would be truncated error " raised while executing the stored procedure. The stored procedure get inserts the records into the table. There is a column called " path " . and the length is 50 - varchar type. But actually the length of the incoming value is 40 character only. But still the error is occurred. I should not increase the length of the field. incoming data is given below. it is trying to insert the values into path field.select datalength(REPLICATE(' ',1) + LTRIM('Case(' + convert(varchar, 3050722) + ') --> ') + '(' + CONVERT(VARCHAR(20),11200) + ':' + CONVERT(VARCHAR(20),3157054) + ') --> ')as lengthDoes anyone knows the answer ? please guide me RegardsBalaji G