Digits After Decimal Piont

Hi,
I think the easiest way is either
1.  change the object properties of the edit field to 'currency' and an 'accuracy' of 2 or 3 decimal places, depending on how accurate you want it (please see the attached example and screenshot); 
2.  initially define 'liters' in your data structure as currency to 2 or 3 decimal places.
Which way you choose depends on what best suits your application.
In both instances, it's important to remember that 'currency' is not actually a data type;  it is simply a 'real' data type with some formatting applied to it - the underlying data type ('real') doesn't get changed.
Derek.