How Delta is enabled for all STD Data source?

Hi All
  I have a weird qns. cropping most of the time. .For generic, naturally you set and create Funtion module to enable the DELTA..
Where as dont know how to see DELTA enable setting for TIMESTAMPS in the STANDARD Datasource...?
Can anyone help how to find for every datasource and also when we enhance the data source how do you go and change the settings or where to check the delta TIMESTAMP settings?
pls give possible step by step and clear answers to inderstand easily.

Hi ,
As per my knowledge
Delta records are directly selected from the R/3 tables using a timestamp mechanism from Timestamp table BWOM2_TIMEST.
Delta records are directly transferred to BW and no record is written to the BW delta queue.
when we have a delta dataset selected successfully, the SAP R/3 system logs two time stamps that delimit a selection interval for a DataSource in table BWOM2_TIMEST in fields AEDAT ,AETIM  ,TS_LOW ,TSS_HIGH.
Table BWOM2_TIMEST serves as a document for loading history from R3. It also provides defined restart points following incorrect data requests.BWOM2_TIMEST is a standard ABAP report available in SAP.It provide the functionality of resetting of the date time of last Delta or Init Extraction from an OLTP system.
ROOSGENDLM is also a standard SAP table available within R/3 SAP systems depending on our SAP version and release level. It stores the delta pointer for each executed Data Source.For the next delta extraction, the delta pointer is therefore extracted from this table and the corresponding delta data is extracted from different DB tables.
The editing of these tables however is not recommended but they are very helpful when we loose delta because of some reason then we can just change ROOSGENDLM table to desired date and it will bring delta from that date .Very helpful in case of rollback of system .Before that we need to maintain entry fro that data source in BWOM2_TIMEST  .
Hope this will be helpful .
Regards,
Jaya Tiwari

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