please help answer and explain part 1 thank you!

The Traditional 3-Way Matching Process The purchasing department of Company X completes a paper purchase order and sends it to Supplier A via fax, with a copy going to the accounts payable department of X. Supplier A ships the goods and they arrive at company X's receiving dock. A clerk at X's receiving dock completes a paper receiving document describing the goods and sends it to X's accounts payable department. Supplier A meanwhile sends a paper invoice to X's accounts payable department. A clerk in X's accounts payable department would match three documents: the original purchase order, the receiving document, and the invoice. If all three documents match, an accounts payable clerk issues a paper check to supplier A. If they don't match, an accounts payable clerk calls supplier A by phone to reconcile any shipment errors. PART 1: Function Modeling (12 points) 4pts 4pts Opts Diagram is accurate Diagram is complete Diagram captures most Diagram does not and complete with with explanatory text part, but missing either match the functional correct notations and in accuracy or requirements functions at each level completeness Develop a functional decomposition model based on the 3-Way Matching Process described above. Note that a business function concerns what is being done and not concerned about the who, how, when and where aspects of the activities, Decompose starting with the topline function (1 level) and ending up to the 30 level 8 pts