n: Sales Agreements are the standard feature in Manufacturing Cloud that allow users to track and manage their run-rate or long-term negotiated business. Sales Agreements unify the data from ERP and order management systems with the contract terms, including planned volumes and revenues, so that both operations and account teams can have a 360-degree view of the customer. Sales Agreements also enable users to forecast their run-rate business more accurately and efficiently by using account-based forecasting. Opportunities are used to track new business or one-off business, not run-rate business. Opportunity or Sales Agreements is not a valid option, as they are two different features. References: What Is Manufacturing Cloud?, Forecast Your Run-Rate and New Business with Account-Based Forecasting, Salesforce Launches Manufacturing Cloud-Aligning Sales and Operations to Deliver More Transparent and Predictable Business Outcomes, Salesforce Blog: Manufacturing Cloud