Delta enable custom func mod data source for Delete record also

Hi,
We have a custom function module data source and the base table on which data is extracted has two time stamp fields ( created on, changed on ) and the data source is delta enabled with the timestamp field.
It works aboslutely fine in Full and initial mode and load data into a target ODS.
Even in delta mode we believe that it works in most of the cases( only change of an existing records and creation of new records). However in the case of delete, we have issues. When the data is deleted from the base table we completely loose the record and cant advice the BW which one to delete.
In order to bypass this we have analyzed the cdhdr/cdpos table and found out that that we can compute the Key field value that was deleted from the last delta run and can include it as such in the data that are extracted.
Big Question is by what mechanism we let the BW know that this is a delete, so that the existing record( with the same key) is actually deleted from the ODS. I have seen some fields like 0RECORDMODE doing things in SAP delivered content. But not sure how we can get this work for our custom data source.
Please let us know whether you need any clarification on this. I shall be prompt to provide points who can resolved this showstopper issue for us.
Thanks

Hi Aruna,
I have tried to explain : "Big Question is by what mechanism we let the BW know that this is a delete"
Now to create a DataSource, you will have to include the information from the Tables as you mentioned:
1: CDHDR
2: CDPOS
In this table you can check the CHANG_ID as the field which gives the information of
1: Overwrite
2: Add
3: Delete
Now when you create the Function Module, make a field similar to this and read the R/3 Table field CHANGE_IND and pass the relevant Indicators to the BW in the Transfer Rules
Like
CDHDR refers 'D' for delete but In BW 'R' denotes Deleted image. So the FM should take care this and pass the blank for all and 'R' for the documents with 'D' for each line item along with the other required fields.You will have to use an ODS in this case.
note: Plz check the logic of Change Ind "E". I am not sure of this type.if you want to delete 'E' then pass the value as 'R' to the BW system for documents with 'E' CHANGE_IND.
Hopes i made it clear.
regards
Happy Tony
Points == Thanks

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