The integration technology Application Link Enabling (ALE) is an important middleware tool in SAP's Business Framework Architecture (BFA). BFA is a component-based architecture enabling software components from SAP and from other software vendors to communicate and be integrated with each other.
ALE can integrate business processes between SAP systems and non-SAP systems as well as between SAP systems.
Please go through the below link to have an idea on your requirement.
ALE is the framework of communication. PI is the interface. That means, to integrate legacy systems, third party applications to your SAP landscape, you need to have them come to SAP systems through PI as PI provides lots of interfaces, according to requirement. ALE includes all possible modes of communciation like RFC calls, DCOM implementation, CORBA through which SAP systems can talk to non sap systems. Depending on the requirement, say if you have very big landscape, instead of developing BAPI's, you can have a PI system in place which can handle interfacing thing and your actual SAP landscape is not exposed to outside world.
if a company is running another erp software from the beginning of their company evolution then they decided to implement sap how the companies previous date can be integrated with sap?
In such a case customers migrate open items from legacy systems to SAP. we use SAP abap programs to uploads such open item data. No specific integration is required.
In case it is really required for: You may look out for SAP certified adapters for the legacy system integration.
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