You configure the logging level by specifying and then editing your own declared logging configuration file (see http://download.oracle.com/javase/) by adding or modifying the following lines:
com.primavera.integration.level = <level>
com.primavera.ws.level = <level>
Where <level> is one of the following values: FINEST, FINER, FINE, CONFIG, INFO, WARNING, SEVERE, ALL, OFF. For example, to set the logging level to ALL, use the following:
com.primavera.integration.level = ALL
com.primavera.ws.level = ALL