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Classic InfoSet 
A classic InfoSet provides a view of a dataset that you report on. You use the InfoSet query for this purpose. The classic InfoSet determines which tables, or fields within a table, an InfoSet query references.
As of Release BW 2.0B, InfoSets are used in the Business Information Warehouse for InfoObjects (master data), DataStore objects, and joins for these objects. These InfoSets are not BI Repository objects but SAP Web Application Server objects. The InfoSet query can be used to carry out tabular (flat) reporting on these InfoSets.
As of Release BW 3.0, these InfoSets are called classic InfoSets.
As of Release BW 3.0A, you can use transformation program RSQ_TRANSFORM_CLASSIC_INFOSETS to avoid having to fully implement classic InfoSets that were constructed and used in Release BW 2.0B. This simplifies the procedure. All DataStore objects and all InfoObjects, as well as their join conditions, are transferred into the new object.

The following restrictions apply:
For technical
reasons, all additional definitions of the classic InfoSet (additional tables,
additional fields, text fields, limits, coding for the various points in time)
are not transferred into the new InfoSet. Comparable definition options
are not available in the new InfoSets. Alternatively, use the option available
when defining BEx queries (calculated key figures, for example). For more
information, see
Query Design: BEx
Query Designer. If this method is not a sufficient replacement for the
definitions stored in a classic InfoSet, continue to use the classic
InfoSet.
You cannot transform InfoSet queries.
...
1. In the ABAP Editor, start program RSQ_TRANSFORM_CLASSIC_INFOSETS (transaction SE38). The Classic InfoSet ® InfoSet Conversion screen appears.
2. On the selection screen, enter the name of a classic InfoSet in the system, as well as the name of an InfoSet that is not already in the system.
3.
Choose
Execute. The program checks
whether transformation is possible, carries it out if necessary, and then
activates the newly created InfoSet.