BASE/1513    Operation too complex: &

     Explanation:  The text string supplied to the macro operator (&) was
     too complex to be parsed by the macro parser.

     Action:  Simplify the expression or break it into several
     expressions and apply the macro operator to each expression separately.
     For filter and relational expressions, you may want to use a function to
     perform the operation.

     See Also:  "Basic Concepts" chapter of the Programming and Utilities
     Guide