I would ask You is it posible to write this format: for a decimal field #,##0.##### in navision using some function, or maybe in a visual studio report designer. But I need to be with funcion , not hard coded. Are there any rules how can I format field in Nav.
Here is a link to the online help with specific details http://msdn.microsoft.com/en-us/library/dd301367.aspx. If you need to you can create a function that accepts a decimal and returns a string so that you can call this function directly.