Both Copy and Delta Link has same functionality i.e.to make a duplicate of an iView and Page.
Copy and Paste:
1) Changes to the source iView do not affect the target iView. Both source and target iViews are independent siblings, having a delta link relationship to the same parent iView.
2) When we copy an iView, the iview id will remain same i.e.the source iview id will be same as target iview id.
Delta Link:
1) Changes to the source iView are updated to the target iView. Changes made to the target iView have no effect on the source object. Once a property of the target iView has been overwritten, changes to the same property of the source iView are no longer updated.
2) When we Delta Link an iview, the iview id will change i.e. the source iview id will change.
For more information please check the below links:
http://help.sap.com/saphelp_nw73/helpdata/en/04/65543ef544489c822597a0e6ff2abe/content.htm
http://help.sap.com/saphelp_nw74/helpdata/en/49/7a5a678cda11aae10000000a421937/frameset.htm
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