Explanation
Email Notifications are the out-of-the-box Manufacturing Cloud function that can be used to notify users if automated processes fail. You can configure the email recipients for flow and process errors in the Process Automation Settings page. By default, the email notifications are sent to the admin who last modified the flow or process, but you can also add additional users or groups to receive the error emails3. The email notifications contain detailed information about the error, such as the flow or process name, the record ID, the element name, and the error message4. References: Select Flow and Process Error Email Recipients, Troubleshoot Flow Errors

To ensure that rebates are paid out only on invoices that have status paid, an admin can create a custom field in the Transaction Journal object, and copy the invoice status data from the source system into that field. Then, the admin can use that field as an eligibility condition in the Rebate Types, so that only transactions that match the criteria are included in the rebate calculation. This way, the admin can avoid paying rebates on invoices that are not yet paid, or that are canceled, refunded, or disputed. References: [Rebate Management - Salesforce Help], Create and Manage Rebate Types - Salesforce Help, Create and Manage Transaction Journals - Salesforce Help, Create and Manage Data Processing Engine Definitions - Salesforce Help, Rebate Management for Manufacturing Cloud - Salesforce Help

n: To enable a phased rollout of the Sales Agreements functionality, a consultant should deploy the new functionality and assign the permission set to the designated users. The permission set grants access to the Sales Agreements object and related actions, such as creating, editing, approving, and activating sales agreements. By assigning the permission set to the designated users, the consultant can control who can use the new functionality and monitor the adoption. The consultant does not need to make the Sales Agreements tab visible for the designated users, as the tab is automatically visible once the permission set is assigned. The consultant also does not need to assign the Manufacturing licenses to all of the users, as the licenses are only required for users who need access to the Manufacturing Cloud features, such as account forecasting and data processing engine. Reference: Get Started with Manufacturing Cloud for Sales, Assign the Manufacturing Permission Sets to Users

Explanation
You can use apex triggers to populate a custom metric on the forecast grid. A custom metric is a field that you can add to the Account Product Forecast (APF) or Account Product Period Forecast (APPF) objects to display additional information on the forecast grid. For example, you can create a custom metric to show the profit margin or the cost of goods sold for each product. To populate a custom metric, you need to write an apex trigger on the APF or APPF object that calculates the value of the custom metric based on the data in the record. You can use the standard or custom fields in the APF or APPF object as inputs for the calculation. For example, you can use the Planned Quantity, Planned Revenue, and Product Cost fields to calculate the profit margin. You can also use the fields from the related objects, such as the Account, Product, or Sales Agreement, by using the relationship queries. For example, you can use the Account Name or the Sales Agreement Status fields to filter the records for the calculation. After writing the apex trigger, you need to deploy it to your org and activate it. Then, you can add the custom metric field to the forecast grid layout and see the values populated on the grid. References: Create Custom Metrics for Account Forecasts, Apex Developer Guide, Relationship Queries

if Sales Agreement List View is not selected in the Account Forecast Calculation Settings, no sales agreements will be considered when calculating the sales agreement metric values of account forecasts. This means that the account forecasts will only reflect the opportunity metric values, and not the sales agreement metric values. To include the sales agreement metric values in the account forecasts, you need to select a sales agreement list view that defines which sales agreements to use for the calculations. Reference: 1: Configure Account Forecast Calculation Settings - Salesforce