Important Tcodes

CSS:

XD01 - Customer Creation
MM01 - Material Creation
KK01  - Create Statistical Key Figure for Controlling Area
ODP1 - Material to SKF
VK11 - Create Condition Record for Material Price

VA21 - Create Quotation for Quotation Type (Service Contract)
CJ20N - Project Creation
VA41 - Create Contract for Contract Type (premium support or Service)
KB31N- Posting Statistical Key Figure to Costcenter
DP91 - Resource Related Billing Request Creation
VF01 - Invoice Creation
VF02 - Invoice Release for Accounting
Cost Posting in G/L F-02 - Salary, Travel and Other Expense.
CJI3 - Actual project Line item costs
OB52 - To open posting period
KE30 to KE35 - Profitability Report for projectwise
KEi2 - PA transfer Structure
KAH2 -  Cost element Group Creation Tcode
oko6 - allocation structue creation
oko7 - settlement profile change
KEA6, KEA0 - Creation of new value filed.


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J1id -  Excise Rate Maintenance. ( VAT and Cst and so on )

SE91 - Message Maintenance 
SE21 - Package Creation
Se93 - Tcode Creation

MM

ME51N -  Creation of Purchase Requisition


ME54N -  Release Purchase Requisition


ME21n - Creation of  Purchase Order

ME29N - Release purchase order

MIGO - Goods Movement

ML81N - Service Entry Sheet

ML81 - Maintain Service Entry Sheet

ME2L - Purchasing -> Purchase Order -> List Displays -> By Vendor

ME2M - Purchasing -> Purchase Order -> List Displays -> By Material

ME2N - Purchasing -> Purchase Order -> List Displays -> By PO Number

ME5A - Purchasing -> Purchase Requisition -> List Displays -> General


IDOC Tcodes 

WE19 - Test tool
WE02 - Display IDoc
WE11 - Delete IDocs

SWIA - WI Administration Report