Hi, (Attempt #2 after registering to the mailing list ...). For some reason, I do not have permission to add a comment in JIRA. Please add this answer in a comment on the case JBRULES-3703. Thanks. =============== The reason of the exception is because the number is treated as a float, ie "-1.0". The workaround is to add a single quote before the number and it will work. =============== Lubos Pechac wrote -- View this message in context: http://drools.46999.n3.nabble.com/Re-JBRULES-3703-Error-parsing-negative-... Sent from the Drools: User forum mailing list archive at Nabble.com.