Changing a Security Transaction 
Use
Use this function to change the current data of a security transaction provided that the transaction flows still have the Blocked for posting status. When you have made your changes, the security transaction remains in the current activity.

If the current activity of the transaction you want to change is order, you can only transfer it to the contract activity using the
Procedure
(ENTER)-
Structure-
Administration-
Trading Data-
Editing Other Flows for the Transaction-
Payment Details-
Cash Flow for the Transaction-
Memos-
Status