DEVELOPER KEY

Hi,

I am trying to create a DS of profitability analysis as described in help.sap.com.

You create DataSources manually in the IMG of the OLTP system (which can be reached using transaction SBIW) under Customer-Defined DataSources ® Profitability Analysis ® Create DataSource.

after selecting the fields when i press on "infocatalog" it asks me for some developer key. how do i get it, what it costs and am i going the right way of creating DS

Thanks

Prashant