UpdateOpportunity operation throwing "JBO-25058: Definition PartySiteId of type Attribute is not fou

Environment: Fusion Application CRM 11.1.1.4 PB14

We are using the OpportunityService web service to update an opportunity customer like:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:typ="http://xmlns.oracle.com/apps/sales/opptyMgmt/opportunities/opportunityService/types/" xmlns:opp="http://xmlns.oracle.com/apps/sales/opptyMgmt/opportunities/opportunityService/" xmlns:rev="http://xmlns.oracle.com/apps/sales/opptyMgmt/revenues/revenueService/" xmlns:not="http://xmlns.oracle.com/apps/crmCommon/notes/noteService" xmlns:not1="http://xmlns.oracle.com/apps/crmCommon/notes/flex/noteDff/" xmlns:rev1="http://xmlns.oracle.com/oracle/apps/sales/opptyMgmt/revenues/revenueService/" xmlns:act="http://xmlns.oracle.com/apps/crmCommon/activities/activitiesService/