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Abhishek Singh 88Abhishek Singh 88 

how to update parent record using child object

Hi All, I have queried parent object through child . and want to update parent object with some values. Here is query. 
List<BMC_Servicedesk_BaseElement> belist=new List<BMC_Servicedesk_BaseElement>();
belist=[select name, Fisma_Low,Fisma_High from BMC_Servicedesk_BaseElement ];
List<BMC_Servicedesk_BaseRelationShip> bsrelation=new List<BMC_Servicedesk_BaseRelationShip> ();
List<BMC_Servicedesk_BaseRelationShip> bsrelation1=new List<BMC_Servicedesk_BaseRelationShip> ();
bsrelation=[select name, Destination__r.Hitrust,Destination__r.Fisma_Low,Destination__r.Fisma_High from BMC_Servicedesk_BaseRelationShip];
for(BMC_Servicedesk_BaseElement be: belist)
{
   for(BMC_Servicedesk_BaseRelationShip berel:bsrelation)
  {
     if(be.Fisma_Low==true)
  berel.Destination__r.Fisma_Low=be.Fisma_Low;
   bsrelation1.add(berel);
}
}
update bsrelation1;
//Note Base Relationship has two lookup filed with same object Base Element As destination__c and Source__c
Abhishek Singh 88Abhishek Singh 88
here at line no.11 , I am updating parent object filed. But its not reflecting on parent object record.Any suggestion would be appriciated.