string value in "<str>" will be truncated to maximum length of
  <num> octets

  Explanation:  Rdb supports strings up to 65535 octets in length.
  Even though you declared this host variable in excess of this
  length only the first 65535 octets will be used if the variable
  is passed to a SQL statement.  Applications which expect to pass
  more than 65535 bytes to Rdb need to be corrected.

  User Action:  Reduce the length to a value less than or equal to
  65535 to eliminate the warning.  The application may need to be
  changes to check for this limit.