Connection Object Delta Load not happening

Hi Gurus,

I am doing integration between ISU and CRM 5.0. I have achieved integration both sides for BP , Contract Account. I have also done initial load for Connection Objects using object 'SI_CONNOBJ'. We are able to see IBase getting created for the Connection Objects but when I change the data in a particular Connection Object it is not trigerring Delta Load for the Object.

Please help me for the same.