Hi Lakshmi
Your query is not very clear
It seems you are trying 2 different ways ?
1. You are trying to activate the replication of text using R3AC1
2. You are trying to use the BADI DOC_CHANGE and there you do not get any result?
I am not sure how step 1 would help to show the text on portal?
Ideally you should read the material text via a RFC enabled FM from ECC and code it in the DOC_CHANGE to update the value
It seems you already have the code written there based on your screenshot then please debug inside of doc_change and see where it is failing
Regards
Vinita