Dear Bhaskar,

You can use the contract for creation of Purchase Requisition, as a Reference.

The content in the contract, can get adopted into your purchase requisition. As i said, this is only the reference for similar purchases. This is not the follow-on activity.

Even Purchase Order can also be referred for creating Purchase requisition, as a reference for new procurement( or Requirement)

Process flow is from Requirement to Order Conversion.

The Orders may be in any form as Contracts, Schedule Agreements, Purchase Orders, etc.,

Creation of Purchase requsition referring the Contract, can done thru transaction ME51N-Create PR, Enabling the Document Overview ON push button

Hope this will provide some thoughts on your query.

Njoy SAP

Regards,

Saravanaganesh