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   It is possible to insert an error string associated to the formal checks
   on the field. The string will be printed when the expression in the Data
   not valid if option results true.

Example:

   the following message has to be displayed

   Quantity must be more than 10 !

   when the following expression

   (Quantity<=10)

   entered in Data not valid if yields true.

   @LEFTITLE = Mailmerge

   Inside the error message string, it is possible to put expressions that
   will be evaluated at runtime by the application. These expression can, for
   example, be used to put the current date stamp in the message itself. In
   order to use this functionality, the expression must be enclosed between
   markers. These markers are "<<" and ">>" which indicate the beginning and
   the end of the expression.

Example:

   To display the date stamp in the error message, associated to field
   validation, enter:

   Date <<DATE()>>. Error trapped.
    // Ex.: Date 02-29-94. Error trapped.