Parallel Processing Bottleneck in POS Inbound WPUUMS01

Will someone explain what is the objective of BD51, if most IDOCs are processed by SAP 1-by-1 using INPUTTYP = 1.
Parallel processing of WPUUMS01 IDOCs seems to be a case of a movie hall with many ticket counters but only 1 usher! IDOC_INPUT_POS_SALES_ACCOUNT seems to me the bottleneck.
Am I right?
Read carefully the two links on BD51
http://help.sap.com/saphelp_nw04/helpdata/en/0b/2a6688507d11d18ee90000e8366fc2/content.htm
http://help.sap.com/saphelp_erp2005vp/helpdata/en/0b/2a6688507d11d18ee90000e8366fc2/content.htm
In SDN IDES the 269 entries in TBD51 are
64 0-Mass processing
170 1-Individual input
35 2-Individual input with IDoc lock in CALL TRANSACTION
Observe vast majority as "1 Individual Input".
After reading Notes 199840 & 118924 mentioned below I implemented small IDOCs and RDBAPP01 parallel processing. But benefit was marginal & disappointing at ~12%.
I checked IDOC_INPUT_POS_SALES_ACCOUNT has INPUTTYP = 1.
I suspect that 0-Mass processing should have given the better performance.
"1" and "2" is for function modules process one IDoc per call.
 is for FMs that use "call transaction method"
INPUTTYP = 0 function modules which process IDocs in packets and good for performance.
 is for FMs that use "direct input method"
IDOC_INPUT_POS_SALES_ACCOUNT is part of Function Group WPUE - POS interface, upload processing which is part of package WPOS. This does not have "call transaction" string nor "bdc".
I read carefully
Note 199840 - POS IDoc inbound dispatcher with locking control is SAP's BP must read
This note says "To achieve a good load distribution in doing so, you should split the large IDocs, which are expensive with regards to processing, according to a defined record length. This mainly affects message types WPUUMS (aggregated sales) .... we recommend splitting a large IDoc into several small IDocs anyway..."
Note 118924 - Parallel processing of IDocs in the POS inbound
"Activate the check box 'parallel posting' in the initial screen of RBDAPP01 and enter the server group defined before.
The system automatically distributes the load to the servers of the server group, and for each Idoc packet it starts a dialog process. For each server all dialog processes except for two can be occupied, therefore always make sure there are enough online processes available."
Looking for comments from IDOCs gurus ....
I spent a huge amount of effort with little to show.
Regards
-jnc

yes i did max performance things on the merging logic now i have to create the idocs in the parallel . can you please help me in wrirting the code of creating idocs in parallel.
thanks in advance.
regards ,
khushi
Edited by: Khushboo Tyagi on Jan 19, 2009 4:24 PM

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yes i did max performance things on the merging logic now i have to create the idocs in the parallel . can you please help me in wrirting the code of creating idocs in parallel.
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Parallel Processing Bottleneck in POS Inbound WPUUMS01

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