Purchase order processing UML activity diagram

This purchase order processing UML activity diagram was created on the base of activity diagram from the software architecture documentation wiki of the Software Engineering Institute (SEI) of Carnegie Mellon University (CMU).
[wiki.sei.cmu.edu/ sad/ index.php/ Image:PurchaseOrderActivityDiagram.png]
"A purchase order (PO) is a commercial document and first official offer issued by a buyer to a seller, indicating types, quantities, and agreed prices for products or services. Acceptance of a purchase order by a seller forms a contract between the buyer and seller, so no contract exists until the purchase order is accepted. It is used to control the purchasing of products and services from external suppliers.
Creating a purchase order is typically the first step of the purchase to pay process in an ERP system." [Purchase order. Wikipedia]
This purchase order processing UML activity diagram example was created using the ConceptDraw PRO diagramming and vector drawing software extended with the ATM UML Diagrams solution from the Software Development area of ConceptDraw Solution Park.

"An Event-driven Process Chain (EPC) is a type of flowchart used for business process modelling. Event-driven Process Chains can be used for configuring an enterprise resource planning (ERP) implementation, and for business process improvement. ...
Businesses use Event-driven Process Chain diagrams to lay out business process work flows, originally in conjunction with SAP R/ 3 modeling, but now more widely. It is used by many companies for modeling, analyzing, and redesigning business processes. The Event-driven Process Chain method was developed within the framework of Architecture of Integrated Information Systems (ARIS). As such it forms the core technique for modeling in ARIS, which serves to link the different views in the so-called control view." [Event-driven process chain. Wikipedia]
The event-driven process chain (EPC) diagram template for the ConceptDraw PRO diagramming and vector drawing software is included in the Event-driven Process Chain Diagrams solution from the Business Processes area of ConceptDraw Solution Park.