[xwiki-users] XWQL datatype question

Hi, I have this class: #set( $participationClassName = "WaihonaCode.waihonapediaResearchParticipationClass" ) Class properties researchparticipation.family (family: List of Users) researchparticipation.research (research: Database List) researchparticipation.participate (participate: Boolean) researchparticipation.datasend (datasend: Boolean) I have this XWQL: #set( $qParticipations = "from doc.object('$participationClassName') as participation where doc.fullName <> 'waihonapediaResearchParticipationTemplate' and participation.research = :thisresearch" and participation.family = :thisUser) I'm getting velocity error: Caused by: org.hibernate.QueryException: could not resolve property: research of: com.xpn.xwiki.objects.BaseObject [ select doc.fullName from com.xpn.xwiki.doc.XWikiDocument as doc , com.xpn.xwiki.objects.BaseObject as participation where When doing similar on a class where class properties are of type string I have no Issues? What should I do with these properties: List of Users (always only 1) and Database List (always only 1)? Gerritjan Koekkoek Vader van Rai Koekkoek (cdls) en voorzitter vereniging CdLS Visit our website<http://www.cdlsworld.org> Facebook<https://www.facebook.com/gerritjan.koekkoek> email&lt;gerritjan(a)cdlsworld.org&gt;