Recently
I have developed a BW flow to load hierarchies data from one InfoObject to another.
I
have found a SAP documentation
that discusses IO 0H_NORESRNO (Display assigned nodes only) usage in such a
data transformations. Recommendation here is to do not map this IO at the transformation
due to performance. The IO mentioned is present in the Hierarchy Header segment
of the transformation. There is also other SAP official help page
where the recommendation is opposite (to do a map it to 'X' value using a
constant).
The
0H_NORESRNO IO is basically driving a behavior of master data attribute values.
Values that are not assigned nodes (attribute values that occur in the
attribute table of the InfoObject but not in the hierarchy) are not saved in
the hierarchy SID table and do not have to be loaded into memory at runtime.
For me the transformation runtime was better in case that I do not map the mentioned IO.
