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Query 
With
the node
Read Data from File, you can use data
from a BW query in an analysis process.
At its exit, the node makes all fields of the query available as source fields for subsequent nodes.
When an analysis process is executed, the required data is read via the ODBO interface of SAP BW.
1. Choose a query from which the data should be read.
2. If the query has variables, select a variant.