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jagadeesh kummurujagadeesh kummuru 

System.QueryException: List has no rows for assignment to SObject"

 hi iam jagadeesh , 
iam new to salesforce ..,
opportunity,opportunity products ,products like 
we customize "saleorder","saleorderlineitem" ,"item"
like addproucts we create a button in saleorder line item we create a additems button
in thin button we 
get the all the current items like same functionality of add products in the "opportunity opportunity products"