SAP TRANSACTION CODES

MM:
ME21 - create purchase order
ME22 - change purchase order
ME51N - Create a Purchase Requisition
ME52N - Change a Purchase Requisition
ME53N - Delete a Purchase Requisition
ME54 - Individual Release of a Purchase Requisition
ME55 - Collective Release of a Purchase Requisition
MIGO - Receive Goods/Services

DEVELOPING:
S001 Abap Workbench
SE09 Workbenche organizer (Transports)
SE11 ABAP/4 Dictionary
SE16 Data browser
SE24 Class builder
SE30 ABAP Runtime
SE32 ABAP/4 Text Element Maintenance
SE35 ABAP/4 Dialog Modules Maintenance
SE36 Logical DatabasesSE37 Function builder
SE38 ABAP/4 EditorSE39 Program Comparison
SE41 Menu Painter
SE43 Area Menu editor
SE48 Call hierarchy
SE49 Program analysis: Table Manipulation
SE51 Screen Painter: Initial Screen.
SE55 Table maintenance dialog
SE80 Repository browser
SE91 Message Classes
SE93 Maintain transaction
SHDB Batch input recorder
SM30 Maintain table views
SM35 Monitor batch input
ST22 Short dump analysis

MONITORING:
ST05 SQL Trace
ST07 Application monitor3.System
SM04 User overview ( Possible to end sessions)
SM12 Table lock Entries
SM21 System log for viewing dumps
SM36 Define background jobs
SM37 View background jobs
SM50 Process Overview
SU53 Display Authorization Values for User
SLG1 View application log
SLG2 Delete application log
SPAD Output devices
SP01 See spool

SAP SCRIPTS:

SE71 Form painter
SE72 Style maintenance
SE73 SAPscript font maintenance.
SE74 SAPscript format conversion
SE75 SAPscript Settings
SE76 SAPscript Form Translation
SE77 SAPscript Style Conversion
SE78 SapScript Graphics Management
SO10 Create standard text module

WORKFLOW:

SWDM Workflow explorer
SWDD Workflow builder
SWUS Start workflow - Test enviromnent
SWU0 Simulate event
SBWP Business workplace
PFTC_INS Create Task/Task group
PFTC_CHG Change Task/Task group
SWUD Dagnosis
SWI1 Work item selection

ENHANCEMENTS & MODIFICATIONS:

CMOD Enhancementprojects
SMOD List SAP enhancements to use in
CMODSHD0 Transaction variant maintenance

ABAP IMG TCODES:

USMM Pressing F8 will display all hotpacks applied.
SEARCH_SAP_MENU Show the menu path to use to execute a given tcode. You can search by transaction code or menu text.
DI02 ABAP/4 Repository Information System: Tables.
LSMW Legacy System Migration Workbench. An addon available from SAP that can make data converstion a lot easier. Thanks to Serge Desland for this one.
OSS1 SAP Online Service System
OY19 Compare Tables
SM13 Update monitor. Will show update tasks status. Very useful to determine why an update failed.
S001 ABAP Development Workbench
S001 ABAP/4 Development Weorkbench.
S002 System Administration.
SA38 Execute a program.
SCAT Computer Aided Test Tool
SCU0 Compare Tables
SE01 Old Transport & Corrections screen
SE03 Groups together most of the tools that you need for doing transports. In total, more than 20 tools can be reached from this one transaction.
SE09 Workbench Organizer
SE10 New Transport & Correction screen
SE11 ABAP/4 Dictionary Maintenance
SE12 ABAP/4 Dictionary Display
SE13 Maintain Technical Settings (Tables)
SE14 Utilities for Dictionary Tables
SE15 ABAP/4 Repository Information System
SE16 Data Browser: Initial Screen
SE16N Table Browser (the N stands for New, it replaces SE16).
SE17 General Table Display
SE24 Class Builder
SE30 ABAP/4 Runtime Analysis
SE32 ABAP/4 Text Element Maintenance
SE35 ABAP/4 Dialog Modules
SE36 ABAP/4: Logical Databases
SE37 ABAP/4 Function Modules
SE38 ABAP Editor
SE39 Splitscreen Editor: Program Compare
SE41 Menu Painter
SE43 Maintain Area Menu
SE48 Show program call hierarchy. Very useful to see the overall structure of a program.
SE49 Table manipulation. Show what tables are behind a transaction code.
SE51 Screen Painter: Initial Screen.
SE54 Generate View Maintenance Module
SE61 R/3 Documentation
SE62 Industry utilities
SE63 Translation
SE64 Terminology
SE65 R/3 document. short text statistics
SE66 R/3 Documentation Statistics (Test!)
SE68 Translation Administration
SE82 Customer Application Hierarchy
SE83 Reuse Library.
SE84 ABAP/4 Repository Information System
SE85 ABAP/4 Dictionary Information System
SE86 ABAP/4 Repository Information System
SE87 Data Modeler Information System
SE88 Development Coordination Info System
SE91 Maintain Messages
SE92 Maintain system log messages
SM12 Lock table entries (unlock locked tables)
SM21 View the system log, very useful when you get a short dump. Provides much more info than short dump
SM30 Maintain Table Views.
SM31 Table Maintenance
SM32 Table maintenance
SM35 View Batch Input Sessions
SM37 View background jobs
SM50 Process Overview.
SM51 Delete jobs from system (BDC)
SM62 Display/Maintain events in SAP
BP_EVENT_RAISESMEN Display the menu path to get to a transaction
SMOD/CMOD Transactions for processing/editing/activating new customer enhancements.
SNRO Object browser for number range maintenance
SQ00 ABAP/4 Query: Start Queries
SQ01 ABAP/4 Query: Maintain Queries
SQ02 ABAP/4 Query: Maintain Funct. Areas
SQ03 ABAP/4 Query: Maintain User Groups
SQ07 ABAP/4 Query: Language
WEDI EDI Menu. IDOC and EDI base.
WE02 Display an IDOC
WE07 IDOC Statistics