Transformation logic for a scenario

Question

Hi Experts,
Our scenario is:
In DSO1 against doc A, there will be doc's created like B,C,D.
Of these B,C,D only one will have follow up doc say E( E should be looked up on DSO2 with a common doc) created against doc C.
A -> B
A          -> C - > E
A         - > D
Requirement:
If any of the 3 i.e. B, C or D have a followup doc i.e. E, then populate a constant say 'W' to Info object 'Status' against all the 3 i.e.  B, C, D.
No rule that A, B, C, D, E will be created on the same day.
Can anyone please let me know how to achive this through a transformation from DSO1 where all the B,C,D will be there and the E should be looked up on other DSO2.
Thanks & Regards,
Bhadri M.

Answer 1

Hi,
First let me mention what I actually understood from your example. Your DSO1 has fields as below
Document1----Document2 Status
A----
B
A----
C
A----
D
Similarly DSO2 has fields
Document1----Document2
C----
E
What you want in DSO1 is below
Document1----Document2 Status
A--B--
W
A--C--
W
A--D--
W
If this is the case, it can be achieved but would be a bit complex.
Hopefully your datasource that fetches the data to DSO1 is a z datasource. Change your datasource logic in such a way that if for a document A followup document B is created on a day, it fetches the records for all the follow up documents that have been created for document A till date. i.e. A->B, A->C, A->D. This way the data coming to PSA would contain all the documents that have been created for A till date. Next, in the start routine you need to write routine to do following:
Select * from DSO2 for all entries in source_package where document2 of DSO1 = document 1 of DSO2 into INT1.
Then loop on source_package. Read from int1 for the document that are in source_package as follow up document. (i.e. to see whether C exists in int1). Once you find that a followup document exists in INT1, copy the main document from source_package into another internal table INT2 (copy A into it). This way in the loop you can collect all the main documents that have followup documents in DSO2.
After the loop ends, start the loop on source_package again.
Now, read whether document1 from source_package (A) exists in INT2 or not. If yes, update status as 'W'.
Thats it.