Loading Hierarchy levels as Navigational Attributes of 0MATERIAL.

Hello Guys, 
bit of background about the issue: 
I am loading 0MATERIAL hierarchy from ECC using 0MATERAIL_LKLS_HIER Data source.(IS Retail). this job runs very fast.
We have a 8 level hierarchy in ECC/BI and the lowest level of hierarchy is 0MATERAIL. I am also loading 0MATERIAL_ATTR from ECC. While loding 0MATERAIL_ATTR into BI, i need to populate each hierarchy level of an artcile as navigation attributes of 0MATERIAL. 
For this requiremetn i wrote a start routine in the update rules and reading hierarchy levels and node names from /BI0/HMATERIAL table. the problem is the performance of the extractor is very very poor. It runs for more than 10 hours every day and it is causing many problems for our transactional data loads. 
Here is the code i am using in my start routine. 
I need suggestions on improving the performance of this extractor asap. are there any other best practices to load Article hierarchy levels as attributes apart from using ABAP lookups?? any help will be appreciated. 
TYPES: BEGIN OF TY_HIER, 
 MATERIAL TYPE /BI0/OIMATERIAL, 
 HIER_LEVEL1 TYPE RSSHNODENAME, 
 HIER_LEVEL2 TYPE RSSHNODENAME, 
 HIER_LEVEL3 TYPE RSSHNODENAME, 
 HIER_LEVEL4 TYPE RSSHNODENAME, 
 HIER_LEVEL5 TYPE RSSHNODENAME, 
 END OF TY_HIER. 
DATA: GT_HIER TYPE STANDARD TABLE OF TY_HIER, 
 WA_HIER TYPE TY_HIER. 
DATA: LT_MAT_HIER TYPE STANDARD TABLE OF /BI0/HMATERIAL, 
 WA_MAT_HIER TYPE /BI0/HMATERIAL, 
 wa_hier TYPE ty_hier. 
DATA: l_nodename TYPE rsshnodename. 
* Retrieving the whole hierarchy table into an internal table 
SELECT * FROM /BI0/HMATERIAL INTO TABLE LT_MAT_HIER. 
* Looping at the data package 
LOOP AT DATA_PACKAGE. 
 WA_HIER-MATERIAL = DATA_PACKAGE-MATERIAL. 
* Sort internal table for binary search 
 Sort LT_MAT_HIER by iobjnm nodename. 
 READ TABLE LT_MAT_HIER 
 INTO WA_MAT_HIER WITH KEY IOBJNM = '0MATERIAL' 
 NODENAME = DATA_PACKAGE-MATERIAL 
 binary search. 
 Sort LT_MAT_HIER by nodeid. 
 WHILE WA_MAT_HIER-TLEVEL > 1. 
 READ TABLE LT_MAT_HIER 
 INTO WA_MAT_HIER WITH KEY NODEID = WA_MAT_HIER-PARENTID 
 binary search. 
* IF SY-SUBRC = 0. 
 SHIFT WA_MAT_HIER-NODENAME BY 3 PLACES LEFT. 
 CASE WA_MAT_HIER-TLEVEL. 
 WHEN '07'. 
 CONTINUE. 
 WHEN '06'. 
 WA_HIER-HIER_LEVEL5 = WA_MAT_HIER-NODENAME. 
 WHEN '05'. 
 WA_HIER-HIER_LEVEL4 = WA_MAT_HIER-NODENAME. 
 WHEN '04'. 
 WA_HIER-HIER_LEVEL3 = WA_MAT_HIER-NODENAME. 
 WHEN '03'. 
 WA_HIER-HIER_LEVEL2 = WA_MAT_HIER-NODENAME. 
 WHEN '02'. 
 WA_HIER-HIER_LEVEL1 = WA_MAT_HIER-NODENAME. 
 WHEN OTHERS. 
 CONTINUE. 
 ENDCASE. 
 ENDWHILE. 
 APPEND WA_HIER TO GT_HIER[]. 
 CLEAR WA_HIER. 
ENDLOOP. 
SORT GT_HIER BY MATERIAL.
 
Thanks in advance 
Cheers 
POPS

Any other thoughts guys...
is there a standard function module where we can specify the lowest level article detail as input and request for level 1 - 5 values ??

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