Hi Frank Join C8:F8 and change the contents to a:Assignment() and w:Weather all conditions deal with Weather - they'll be inserted into the last pair of parentheses that will be added to Weather. (The "and" is redundant as it is implied for patterns at the outermost level. There should be a single Assignment fact, and I guess there is only one Weather.) I would not add an update(a) to each individual action; another ACTION column with $param; in row nine and "update(a)" in all rows below lets you remove the repeated "update(a)" from H9:J9. (But this is, perhaps, a matter of taste.) Cheers Wolfgang PS: Regretfully, this set of rules is going to be late for this winter ;-) On 27 December 2010 10:23, FrankVhh <frank.vanhoenshoven(a)agserv.eu <mailto:frank.vanhoenshoven@agserv.eu>> wrote: Hi all, I am a brand new user of the Drools-tools and am not quite comfortable with the tools yet. The current problem I am having, is caused by an "Unknown parsing error" in a decision table. >From past experience, I guess I have made a syntax error somewhere in the file. However, I am not able to detect the error myself. Probably it is a quite simple mistake, caused by a combination of inexperience and neglectance :-). I figured I could use an extra pair of eyes and was hoping that some friendly community member could help me out on this. I will annex the table as well as the java code that contains the java classes (the table isn't callad from the code yet). http://drools-java-rules-engine.46999.n3.nabble.com/file/n2150980/strooid... strooidiensten.java http://drools-java-rules-engine.46999.n3.nabble.com/file/n2150980/clearan... clearance.xls Thank you very much in advance! Kind regards, Frank -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Decision-Table-tp2150... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users