Altiris 7.1 Receiving ITAM Problem

1.When I receiving item, I don't know I should choose which choice in  "the items should be received as". What are their diiferent ? 

2.When I choose "Update an existing Resource / Add the Condumable to a Stockroom and Add as a Cost Item to existing Resource", the received line items show the System Number, What dose this mean? and I select  the Exisiting Resource/ Stockroom, I cannot updated the resource, What does the problem in this case.

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