MM flow is processing  between business organisation and Vendor:

1...Purchase Requisition --- T.code ---ME51

2...Source List -----T.code-----ME41

3...Request for Quation (RFQ)---T.code--ME21N  (To Vendor)

4...Purchase Order  ---- T.code ----ME21N (To Vendor)

5...Goods Receipt-------T.code....MIGO
      (Tables:  MKPF, MSEG)

6...Invoice Verification----T.code...MIRO
      (Tables: BKPF , BSEG)

7...Vendor Payment----T.code...FB60 (FI - Account Payable)

MM Table Link:

SAP MM Reference Books:
SAP Material Management Interview Questions, Certification and Configuration Books

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SAP MM (Materials Management) Configuration Hints and Tips

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