ODS Activation Returns 0 records in the Change Log

Hi All,
I have question regarding the Change Log build after the ODS req has been activated.
BW system - SAP NetWeaver BI 7.0 - Level 15
Upon loading a delta request into the ODS and Activating, it adds no records to the change log table.But the active table gets correct records
Checks I Did
ODS -> Menu-> Environment -> Delete Change Log Data.
     No job scheduled or runing to delete the change log reqs (sm37)
RSRV - Check the Status of the Generated Program of a Data Store Object
ODS - reactivation to see if it works..
ODS Manage - Auto Req Processing set Quality status, Activate DSO to Yes.
The Activation Log shows at the end that they were no changed records added:
Data pkgs 000001; Added records 0; Changed records 0; Deleted records 0                 
Log for activation request ODSR_4APQQHKM459YNO7CIGCE0629U data package 000001...000001  
Activation of records from DataStore object C_PUR_C sucessfully finished               
U table for DataStore object C_PUR_C deleted successfully                              
Job finished                                                                               
Can anyone help on the above issue??
Thanks
Rao

Hello Siggi,
Referring to the previous post:
I have a situation where few documents are not transferred to Change log during DSO Activation, though the After image values of these records are reflected in Active table.
I have found one common pattern for those documents which are not recorded in Change Log.
They have two pairs of After and Before image records.
First Pair like this: Eg: Overall status as the only data field.
Sales Doc     Overall Statuls   Recordmode
1001             C                      X
1001             A                      
Second pair:
1001            A                      X
1001            C                     
If we consolidate all these 4 records there seems to be no change for any data fields. Should I consider this as the standard behaviour while activating DSO - causing these records not to get recorded in change log?
Or is there any SAP Note that can make sure the change log gets populated in such case.
Hope my details are clear to you..
- Varma

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