How to load 3.x hierarchy data source from a certain level ?

Question

Hi all,
I have an old 3.x hierarchy data souce which has a structure like below :
　　　Level 0 :  root node
              Level 1:  Product Category
                  Level 2: Product Line
                      Level 3: Product
                          Level 4 : Product Version
each level has independent infoobject for it.
The hierarchy was initially constructed for the infoobject on the level 4 'Product Version'.
Now here comes anther requriement, we also want to have a hierarchy for 'Product' and try to reuse the datasource.
So the question is , is it possible to extract from the same data source, while just update the hierarchy for 'Product ' starting from the level 3 (up to level 0)?
PS: i can't migrate the data souce to 7.X, because the source system doesn't support.
I hope I made my question clearly.
Really apprericated that you can give me a hint.
Thanks,
Amon

Answer 1

Finally I solved this problem myself.
there are many mays if you want to realize the requirement, only if you change your way of thinking, don't be stuck your mind with the thought we have to use the original data source coming from the source system.
  I'd like to introduce 2 ways I am thinking of:
1. use the SAP standard program 'Z_SAP_HIERARCHY_DOWNLOAD' to save the hierarchy as a .csv file, then you can refer to http://scn.sap.com/community/data-warehousing/bw/blog/2012/01/08/bw-730-hierarchy-loading-becomes-easier-with-the-help-of-new-framework
however this didn't work for me, because the program might be outdated in my working environment BW7.4, though I did some bugfix for this program , the output file seems with some errors.
2. since the hierarchy for the 4th level infoobject has been successfully updated in my case, we can use it as the data provider directly . Here is the general dataflow : 4th level infoobject hierarchy -> DSO -> target infoobject hierarchy (3rd level infoobject) .
for this DSO strucure, you should also refer to the link above, the structure is just like the EXCEL file provided. but you should be aware of adding external characteristics in the data fields of your DSO if there is external characteristics in your hierarchy.
in the transformation of 'source infoobject hierarchy' , you should select 'hierarchy (one segment)' as the subtype of hierarchy.
in the transoformation of 'DSO -> target infoobject' , you should map the source and target carefully , especially for the segment 'Structure' , you should make sure the field 0H_HIERNODE and the external chars. have proper value filled.