Closed
loop systems use feedback where a portion of the output is fed back to the
input to reduce errors and improve stability. In BW world we can say that
transformation of data that runs on top of same InfoProvider object (cube,
aDSO) are the closed loops. In nutshell data transformation it writes data back
to its source.
Such
a scenarios are used quite often in BW. One of example can be a calculation of
additional key figures on top of those that were calculated during a load from
different objects underneath the target object.
Topic
of closed loops appears when there is a migration
to BW4/HANA. Normally during the migration BW objects that are not
supported in BW/4 anymore need to be converted to the new objects. BW/4
requires these closed loops data loads and associated DTPs to be remodeled. In the
BW/4 some write optimized aDSO needs to be part of the flow.
In order to
help with the remodeling there are few tools (ABAP programs) provided by SAP:
RSB4H_REBUILD_CLOSED_LOOP_DTPS
Rebuild closed loop DTPs
RSBK_FIND_CLOSED_LOOP_DTPS Identification
of closed loops
More information:
3013897 - Closed
Loop DTPs in the context of BW4/HANA Conversion
3019023 - Transfer
Tool DTP & RSSM (41) - Report to rebuild closed loop DTPs
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