error when trying to change the length of the description field in item card

Hi

Iam getting an error " Overflow type conversion from text to code " when the field length of decription column in item card is changed "

My requirement is my client description is larger than 30 characters which is defalt in navision so i want to increase the size plz help me

Thank u

Locked topic, due to cross posting: http://dynamicsuser.net/forums/t/26633.aspx