Rules definition
Each transaction has a space to specify rules that must be triggered upon entering, modifying or deleting items (records), so as to ensure certain behaviors.
		In the Customer transaction, how can we:
	- Not allow the entry of a customer with empty name, or when trying to enter a date later than today’s date (Error rule).
 - Show a message as a warning notice when a field is left empty (Msg rule).
 - Automatically assign today’s date to a date attribute (Default rule).
 - Disable the edition of an attribute (Noaccept rule).
 
Read the video script here.o isEmpty