i have made a sales order example 100 then i did pgi of sales order no 100 till full amount and lastly i made billing through vf01 and i save it suppose bill no is-90000367.here i have taken item categ. tan and here i have change billing relevance is b so we can make order related billing right.in copy control (vtaa)i have made doc update flow check box'x' so we can updated doc.
but my question is when i have a billing doc 9000367 against sales order100 and i m trying to creat again a bill for sales order 100
it gets created ang it generate new billing number example 9000368. according to me it shud show error message because we have already made a bill for sales order 100 but i m not getting error message. plz help me to solve this problem