A not so common use of the string command is to translate a Boolean value into text. The snippet below shows how too use the String command in this role.

Instead of:

If([INVOICE]Paid = True)   $Answer_T:="Yes" Else   $Answer_T:="No" End if

Do this:

$Answer_T:=String([INVOICE]Paid;"Yes;;No")

Note, there is are two semicolons separating the responses. This is a format string, not response values.

Alternatively you could use the Choose command:

$Answer_T:=Choose([INVOICE]Paid;"Yes";"No")

In this case note there are two response values.