Checks if an account must be specified on the checkin page.
Used on the Standard Page Resources page to display an error message if an account is not specified.
Returns TRUE if an Account value is required.
Returns FALSE if an Account value is not required.
Evaluates whether an account number is required and displays an error message.
<$if not EmptyAccountCheckinAllowed$> <$isRequired = 1, requiredMsg = "Please specify an account."$> <$endif$>