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To transfer data into your R/3 System from a legacy system or from another R/3 System you can use the batch input (BI), call transaction (CT) and direct input (DI) methods.
There are two methods to transfer data:
1. Standard transfer programs:
For many standard transfers, there are already standard data transfer programs in the R/3 System. You do not need to write your own batch input program. You need only to ensure that the data is available in the format specified by SAP.
2. Customer transfer programs:
Here you can create your own data transfer program. You can also determine the structure of the data.
The method used to transfer data determines the actual conversion of the data, as this decision establishes the structure of the SAP format.