Library /sys$common/syshlp/basichelp.hlb Compile time errors, FUNINVNOT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  ERROR - An external function invocation (including a  parameter  list)
  appears  on  the  left  side  of  an assignment statement.  Remove the
  assignment  statement.   You  cannot  assign  values  to  a   function
  invocation.