If you cannot migrate your multiplex database, try this alternate method.
Drop all query nodes, to change the SAP Sybase IQ 12.7 multiplex to a simplex database.
Follow the steps for simplex databases to migrate the database to SAP Sybase IQ 16.0.
Convert the simplex SAP Sybase IQ 16.0 database to multiplex, following the steps in Administration: Multiplex > Create Multiplex Servers > Converting Databases to Multiplex.