Interface to Non SAP MFS(ASRS) System

Dear All,

I'm planning to interface the EWM to Non-SAP ASRS system and following the Fully Automated Warehouse as a Black Box process.

For this my querie is  how I need to fetch the data from non SAP system ?

Is we need to maintain any custom tables and from there we have to fetch the data or any ?

Pls provide your valuable inputs for the same.

Thanks

Venu