KRACOEUS-7608 : Project Income: Interaction for Edit/Save/Delete

It's the initial work.
if @{#ViewHelper.isBudgetLineItemEditable(#collectionGroup.bindingInfo.bindingPath,#index,editableBudgetLineItems)} returns true (or hard coded ) the button will show. 
I think the problem is when the item has not been saved in to the DB yet, above checking is not going to work. So I was hoping to see after the item being saved if the "Edit" button shows. but could not make it yet. 
The "Delete" should be there any way, so I  set it to be "true". Is this OK?