[rules-users] Logic in the when clause

Hi, quick newbie question about the when clause in a rule. eg can i get the fact to be tested from the result of two other inputted facts? details.HOME_MATCH_SCORE - details.HOME_FULL_TIME_SCORE > details.AWAY_MATCH_SCORE - details.AWAY_FULL_TIME_SCORE I assumed this would work fine but it doesn't recognise the '-' as a minus! Thanks in advance Alex ________________________________________________________________________ Privileged, confidential and/or copyright information may be contained in this communication. This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you are not the intended addressee, you may not copy, forward, disclose or otherwise use this e-mail or any part of it in any way whatsoever. To do so is prohibited and may be unlawful. If you have received this email in error please notify the sender immediately. Paddy Power PLC may monitor the content of e-mail sent and received for the purpose of ensuring compliance with its policies and procedures. Paddy Power plc, Airton House, Airton Road, Tallaght, Dublin 24 Registered in Ireland: 16956 ________________________________________________________________________