Search Reference document UI not showing up during complaint creation

Hello Gurus,

I am trying to create a Follow Up Complaint from a service request, but when I select my follow up complaint transaction type I am directly navigated to Complaint creation overview page Instead my requirement is I should be navigated to "Search Reference document" UI screen because we wanted to search for ERP Sales Transaction to add items into CRM Complaints.

I know that it can be achieved from Item assignment block of Complaint transaction but I wanted to the ERP Sales order Search option available.

for the same Complaint transaction type when I try to create it by clicking on work center "Complaint", I get the "Search Reference document" UI Screen, I want similar screen when I create the complaint as follow up to CRM Service Request as well.

how do I achieve this?

Thanks

Chandu