1. Transaction end with number got its own meaning.

00 = MAIN MENU
01 =  ADD
02 = MODIFY
03 = DISPLAY




Fore example:

MR01 – ADD AN MM INVOICE
MR02 – MODIFY A MM INVOICE
MR03 – DISPLAY A MM INVOICE
ME00 – PURCHASING MAIN MENU
ME21 – CREATE A PURCHASE ORDER
ME22 – CHANGE A PURCHASE ORDER
ME23 – DISPLAY A PURCHASE ORDER
 


2. Transaction code starting with certain letter mean is suit for different module.
Letter
Definition
F
 Financial
FK
 Financial Vendor Master
FS
 Ledger Accounts
FB
 Shared Financial Transactions (Shared between A\P A\R Assets G\L)
M
 Material Management
MK
 Material Vendor Master
MB
 Goods Receipt -  Inventory Management
MR
 MM Invoice Verification
ME
 Purchasing
ME1
 Purchase Requisition
ME2
 Purchase Order
MM
 Material Master
V
 Sales & Distribution
VA
 Sales Order
VF
 Billing
XK
 Central Vendor Master
XD
 Central Customer Master
O
 Usually configuration Transactions (Config transactions begin with various letters)

Within transactions the following letters have meaning. These letters also refer to General Ledger account types and are used in naming system tables.
A
 Assets (first letter fo the German word Anlagengegenstand)
D
 Customer/ debit type transactions (first letter of German word Debitor)
K
 Vendor/credit type of transactions (first letter of German word Kredit)
M
 Material (first letter of German word Material)
S
 Ledger (first letter of the German word Soll)


Example:
D, K, M, S can be view in transaction F#01 - Create Financial Custimer, Vendor or Ledger


The F at the beginning denotes a financial tranaction,
The 1 at the end denotes CREATE.
FD01 is create financial level customer accounts.
FK01 is create financial level vendor accounts
FS01 is create financial ledger acc
ounts.

This letter can be viewed from system table creation, ecample:

BSIS – Open ledger items
BSAS – Closed ledger items

BSIK – Open vendor items
BSAK – Closed vendor items
 
BSID – Open customer items
BSAD – Closed customer items




source: http://goo.gl/8bpsY

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