Source object currency field can be added as a form component as described here: Adding data source fields

Components Basic Properties 

The Currency component (1) has no specific settings.

The Currency component has the following specific features:

• it is automatically formatted as financial value (with thousands and decimal separators).
• it has 2 decimal digits (to represent 1/100 of currency unit values like cents) always displayed.
• it has currency symbol (2) shown when is not being edited (when currency value is being edited, no currency symbol is displayed). This symbol is added automatically correspondingly to Company Settings (3).
• it allows negative values.