Hi Lokesh,
for me it does not seem to be so strange to split Can Add from the other privileges.
Let us have in mind, that every EXISTING Item points to exactly one permission - it does not make too much sense to assign to an Item, who would now have the right to create it - it IS already created.
Having the pointer to a permission per Item(!) allows for individual permissions, possibly changing during the life of an Item dependent on the maturity (status) or being varied by private permissions respectively an access change.
So the split of privileges allows for general control per ItemType (and optionally subclass) the creation of Items, but on a per Item base for the access to existing Items.
