Create a process chain that reads the data from the application server and loads it through the usual BW process into the InfoObject.
Create a program that loads the data, in CSV format, to the application server, and then launches this chain. There is a released function module API for launching process chains. https://wiki.scn.sap.com/wiki/display/BI/Function+Module+RSPC_API_CHAIN_START+-+Start+Process+Chain
what do you mean with maintenance? are you planning to create new entries, or do you want to change existing ones? about how much lines are you talking, 100, 1000, millions?
You can download to xls (find how to on the world wide web). create an extractor based on this xls file. you can adapt in the xls before uploading the changed values.
M.
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