This configuration activity is helping organizations to prevent fraudulent activities related to changing important field. If we define some field as sensitive, then every change of it, including initial creation, will require additional confirmation through different transaction code.
IMG Path: Financial Accounting (New) -> Accounts Receivable and Accounts Payable -> Vendor Accounts -> Master Data -> Preparations for Creating Vendor Master Data -> Define Sensitive Fields for Dual Control (Vendors)
When you open the transaction, initially you will not have entries here. Click on new entries to add a sensitive field.
Add the field names you want to be defined as sensitive and hit save.