Start Routine Logic Updating Field in Target ODS

Question

Hi,
I am creating a  Start Routine to Update Field (date) from one ODS to another based on the Key Structure: Document Number, Line Item Number.
I am encountering a situation as follows:
Source
Doc Num 1 Line Item 10 Date 1/1/1
Target
Doc Num 1 Line Item 10 Date 1/1/1
DocNum 1 Line Item 20
DocNum 1 Line Item 30
DocNum 1 Line Item 40
The Routine I have now correctly updates line item 10 with the date 1/1/1.
I am trying to modify the code to only update the target ods if all of the line items are in the source.  In this example Line Item 10 would not get updated since Line Items 20,30,40 are not in the Source ODS. 
Has anyone encountered something like this.
Thanks for any help.

Answer 1

Hi,
If you have all the line items in target for which you want to do updates  you can do this in transformation start routine.
Try this first hand logic :
1. Create a internal tables(say SOURCE_INTERNAL_TABLE and TARGET_INTERNAL_TABLE)
    with fields document number and another field integer say COUNTER
2. Read active table of source for all the document numbers in source package.
3. Update the SOURCE_INTERNAL_TABLE for all the document number with appropriate counts
    (All the records of same document number should be in same data package)
4. Update the TARGET_INTERNAL_TABLE by reading the target ODS as done for source.
5. LOOP  AT SOURCE_PACKAGE
     if COUNTER in SOURCE_INTERNAL_TABLE and TARGET_INTERNAL_TABLE is not same
     then delete the record from source package itself
   END LOOP
6. Your next code
    (Please take care that you are not referring the deleted records otherwise it will through a dump)
If you don't have all the line items in target then you need to bring them somewhere in BI (document number and item number only sufficient with both as a key fields) so as to refer them in your start routine.
Please update me if anything is wrong or if any corrections in logic.
Thanks and Regards,
Prashant Vankudre.