The link between SD and MM :- 

1. When you create sales order in SD, all the details of the items are copied from Material master of MM. 

2. MRP and availability check related data is also taken from MM although you control this data in SD also. 

3. While you create inbound/outbound delivery with reference to a sales order, the shipping point determination takes place with the help of the loading group, plant data, shipping conditions etc. This also refers to Material Master. 

4. The material which you are entering in a sales order must be extended to the sales area of your sales order/customer otherwise you cannot transact with this material. 

There are many such links between SD and MM. 

Now the link between SD and FI :- 

1. Whenever you create a delivery with reference to a sales order, goods movement takes place in the background. eg. In case of standard sales order, you create an outbound goods delivery to the customer.

Here movement 601 takes place. This movement is configured in MM. Also, this movement hits some G/L account in FI. Every such movement of good s hits some G/L account. 

2. The accounts posting in FI is done with reference to the billing documents (invoice, debit note, credit note etc) created in SD. Thus this is a link between SD and FI 

3. Tax determination: In case of a tax determination also, there is a direct link between SD and MM 

SD Integration points with other modules 

SD module is highly integrated with the other modules in SAP.

Sales Order

Integration Points                   Module
  
•Availability CheckMM
  
•Credit Check                            FI
  
•Costing                      CO/ MM
  
•Tax Determination               FI
  
•Transfer of Requirements             PP/ MM

Delivery and Goods Issue

Integration PointsModule
  
•Availability CheckMM
  
•Credit CheckFI
  
•Reduces stockMM
  
•Reduces InventoryFI/CO
  
•Requirement EliminatedPP/MM

Billing

Integration PointsModule
  
•Debit A/R FI/ CO
  
•Credit Revenue FI/ CO
  
•Updates G/ L FI/ CO
  
(Tax, discounts, surcharges, etc.) FI/CO
  
•Milestone Billing PS

Return Delivery and Credit Memo

Integration PointsModule
  
•Increases Inventory MM
  
•Updates G/ L FI
  
•Credit Memo FI
  
•Adjustment to A/R FI
  
•Reduces Revenue FI

SD Transaction Code Flow: 

Inquiry / Document type IN

Transaction code for creation VA11,VA12,VA13. tables VBAK,VBAP

Quotation / QT

Transaction code for creation VA21,VA22,VA23. tables VBAK,VBAP  

Sales Order

Transaction code for creation VA01,VA02,VA03. tables VBAK,VBAP  

Delivery

Transaction code for creation VL01,VL02,VL03. tables LIKP,LIPS  

Billing

Transaction code for creation VF01,VF02,VF03. tables VBRK,VBRP 

Excise Invoice (Only for India – Manufacturing Scenario)

Transaction code for creation J1IIN.

 Note: Tables for Document Flow –  VBFA