How to build a SAP SCM interface to a legacy system

5 pts.
Tags:
Legacy systems
SAP
SAP migration
SAP SCM
Hi all;
I have a business requirement that state the creation of an synchronous interface between SAP SCM 7.0 to a legacy system. 
This is the general overview of the process:
1. A sales order is created in a back end system
2. The sales order is replicated into SAP ECC (this interface is already developed)
3. An outbound delivery is created with reference to the sales order in SAP SCM eWM, which generates a reservation of stock.
The interface will consider that when a sales order is cancelled into the backend system notifies SAP SCM ewm the cancellation and the release of the stock.
Primary I would  like to know what are the options  to connect both system (legacy and SAP), what are the basic technical requirements, how the connection between both systems is accomplished.
A really appreciate your help on this 
Best Regards


Software/Hardware used:
sap scm 7.0

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