Purchase Order and Sales Order Workflow

Purchase Order workflow ( Transaction : ME23N) determines the approval path for the buying organization . It first goes to the buyer, buyer's manager & thereafter based on the cost center & the associated amount, it goes for approval through the Cost Center organization .

i.e,

Buyer ( Requestor in the procurement deptt. of the buying organization)

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Procurement Manager
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Cost Center org. approval ( based on amount & Sign.Authority level)

Regarding , Sales Order( Transaction: VA01); it is created in the Sales Org of the company & basically governs the pricing structure of the order .The routing of an SO is

Sales Org. ( based on the cost center of the sold item)

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Distribution Channel
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Division
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Reg. Sales office
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Sales Group
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Sales Person