Explanation
According to the Salesforce Manufacturing Cloud Learning documents, the actuals calculation mode in the sales agreement setup determines how the actual quantity and amount for products are calculated from active orders associated with a sales agreement1. If UC wants to avoid bringing actual orders data into Manufacturing Cloud, but still use it for its sales agreements, it can select the automatic mode from orders through contracts2. This mode creates contracts and orders from the related list of a sales agreement record and derives the actuals from them.
References:
* Refresh Actuals Calculation Action
* Choose How Sales Agreement Actuals Are Calculated
* Approve and Activate a Sales Agreement
* Create Orders Associated with Contracts to Calculate Sales Agreement Actuals