Sorry, you are right - the User Guide doesn't have that.
Basically you should be looking for these 2 lines:
log4j.logger.BUSINESS_LOGGER=GENERIC#com.bas.basserver.persistence.log.BASLogLevel, C_BUSINESS
and
log4j.logger.TEST_LOGGER=GENERIC#com.bas.basserver.persistence.log.BASLogLevel, L_TEST
The first one controls logger in the main mode and the second one - in the testing mode.
You can change "GENERIC" in the above lines to be one of the following:
1) GENERIC - minimal level of logging
2) ACTION_EXECUTION - medium level
3) RULE_EVALUATION - maximum level