Using variables in Rule Processor application fields
To use simple variables in the Rule Processor application fields, enter the variable name in the field prefixed with an ampersand (&).
On the Variable Dependencies panel, you do not have to prefix the variable name with an ampersand for simple variables.
To use compound variables, enter the variable name in the field prefixed with an ampersand and an exclamation mark (&!). On the Variable Dependencies panel, you must still prefix the variable name with an ampersand and exclamation mark (&!) for compound variables.
The only exception to these two rules is for the Action: Set Variable action specification panel. On this panel, you do not need to use the special characters for either simple or compound variables because any value entered in this field is treated as a variable.