The account product period forecast record limit is the maximum number of records that can be

stored in the Account Product Period Forecast object, which represents the quantity and revenue

information of products for a particular time period of the forecast rolling period1. The default limit

is 9 million records, but it can be changed by the admin2. If the org hits the limit, new products

cannot be added to account forecasts, and new products are not added when recalculating a single

account forecast or recalculating all account forecasts2. This means that the forecast data will not

reflect the latest changes in the product portfolio and may affect the accuracy of the forecast. The

add products option will still appear on the agreement terms tab, but it will not work if the limit is

reached. New products added to account forecasts will be included in recalculations, as long as the

limit is not exceeded. Reference: Considerations for Working with Manufacturing - Salesforce, Define

Account Forecast Settings Unit | Salesforce Trailhead Module, Advanced Account Forecasting with

Manufacturing Cloud | Salesforce, AccountProductPeriodForecast | Manufacturing Cloud Developer

Guide | Salesforce Developers