Dear Rahul,
I was unchecked "copy control for activities" in path CRM -> Transactions -> Settings for Activities -> Activate Copying Control for Activities.
I controlled follow-up transaction functionality using authorization as client process supported. But all business activities display in follow-up transactions for all the transactions once we uncheck the above option.
Below notes help more..
1639521 - Preparation Note ERP document flow for CRM activities
1639733 - ERP document flow for CRM activities in CRM Web Client UI
1639738 - Display of CRM Activities in the ERP Document Flow
1641523 - CRM activity Fixed values for sales document category
1649377 - Description text in ERP document flow for CRM activities II
Thanks and regards,
Shaik.