Before using the DB2 API to perform bulk data loads, install the IBM Data Server Runtime Client on the host where the Virtual DataPort server runs. Download it from http://www-01.ibm.com/support/docview.wss?uid=swg21385217

After this, when enabling “Use bulk data load API” on the “Read & Write” tab of the data source, enter the path to the directory (not the file) where this client is installed in the DB2 executables location box.