Ankit,
The customer wants to buy goods. It informs a sales organization (0022).
This sales organization does not have the goods, and wants another sales org (0020) to send the goods to the customer.
Based on the demand of 0022, 0020 sends the goods to customer. Therefore 0022 is the customer and contact point for 0020.
SAP has given a functionality to represent sales organization 0022 as a internal customer 10308 also.
0020 will bill 0022 or 10308 when an invoice is created (after external customer confirms that goods have reached)
TW