Hi Rahul,
In understand what you are trying to achieve. I am familiar with the concept to trigger an upload from OLTP. My only doubt is the dependency between master data and transaction data. I wonder how you can manage that using a pull mechanism (for master data) and a push mechanism (for transaction data) at the same time.
Let's go back to your initial question; does it work now as you expected? Does the released background job contain the appropriate scheduling and the additional step with the program to trigger an event in BW?
Last but not least, please also review SAP Note 409239 - Automatically trigger BW loads upon end of V3 updates. It might give you an alternative approach.
Best regards,
Sander