Creating an Extended Contract
You create an extended contract from an existing sales document (customer order or contract) in order to maintain and track additional information that is not available as part of standard sales order processing, as well as to use advanced order processing and billing functions, such as alternative document billing structures, ITD billing, fund assignment etc.
See Extended Contract Maintenance.
1. On the SAP Easy Access screen, choose one of the following menu paths:
¡ If you are creating an extended contract from a customer order, choose Logistics → Sales and Distribution → Sales → Order → Display.
¡ If you are creating an extended contract from a contract, choose Logistics → Sales and Distribution → Sales → Contract → Display.

You cannot edit a sales document and its extended contract at the same time. This means that you cannot create or open an extended contract from a sales document in Change mode.
2. Open the sales document for which you want to create an extended contract.
3. Choose Ext. Contract Data.
...
1. On the SAP Easy Access screen, choose one of the following menu paths:
¡ Logistics → Sales and Distribution → Sales → Order → Advanced Order Processing and Billing
¡ Logistics → Sales and Distribution → Sales → Contract → Advanced Order Processing and Billing
2. In the Sales Document field, enter the document number of the original sales document for which you want to create an extended contract.
3. Click Create.
4. Click Go.
An extended contract is created and opens in the Advanced Order Processing and Billing browser window. For more information on the structure of an extended contract, see Extended Contract Maintenance.