This program is not designed for a certain BAPI.
Basically what it does is it parses an XML file to get xml values and then with this values you can call the BAPI you need to call.
For example you need to create a Sales Order using BAPI_SALESORDER_CREATEFROMDAT1 and the data you need is contained on a XML file.
With the program you read the XML values and then you fill the BAPI structures with the exctracted XML values.
Hope this helps