SugarCRM Decimal Field

Hi All,

I have created the decimal type field using vardef where the length is 18 and precision is 15 which is also same in MySQL but when i try to update the field value up to 15 decimal like 34.1234567899876489, it is storing as rounded value up to 11 digit like 34.12345678999

Can someone let me know what exactly i need to do to achieve this.