SAP MM Important T code

Here is the list fo some important t code usede in procure to pay cycle)P2P) in SAP MM.

MM01 - Create Material
MM02 - Change Material
MM03 - Display Material
MM04-  Display material change document
MM06 -  Deletion flag
MM50 - List Extendable Materials
MMBE - Stock Overview
ME5A - Purchase Requisitions: List Display
ME01 - Maintain Source List
ME03 - Display Source List
ME04 - Changes to Source List
ME11-  Create PIR
ME12-  Change PIR
ME13-  Display PIR
ME21N - PO creation
ME22N - PO changes
ME23N - PO display
ME31 - Create Outline Agreement
ME31K - Create Contract
ME31L - Create Scheduling Agreement
ME32 - Change Outline Agreement
ME32K - Change Contract
ME32L - Change Scheduling Agreement
ME44 - Maintain RFQ Supplement
ME45 - Release RFQ
ME47 - Create Quotation
ME48 - Display Quotation
ME49 - Price Comparison List
ME87 - PO History List
ME51N - PR creation
ME52N - PR changes
ME53N - PR Display
ME54 - Release Purchase Requisition
ME29N - Release PO
ME59 - Automatic Generation of POs
XK01 - Vendor Creation
XK02 - Vendor data Change
XK03 - Display vendor
XK04 - vendor change centerally
XK05 - Block vendor
XK06 - deletion flag for vendor
MB1A - Good issue
MB1B - Transfer Posting
MB1C - Enter other good Reciept
ME41 - Create Request For Quotation
ME42 - Change Request For Quotation
ME43 - Display Request For Quotation