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Sascha DeinertSascha Deinert 

Trigger Relationship Field


I have a very simple trigger which is working fine in the sandbox but it doesn't work in the production. If someone change the owner of the opportunity or add a new opportunity the customfield team__c should be filled with the owner team value. But if I change the owner the field keep blank. If I change the team field at the opportunity manuelly and then I change the owner then becomes the field also blank.
trigger setTeamOpportunity on Opportunity (before update) {

 for(Opportunity o : { 
     Opportunity oldOpportunity = trigger.OldMap.get(o.ID);
         if(o.ownerid != oldOpportunity.ownerid) {
                    o.Team__c = o.Owner.Team__c;
Can someone help me please.