When you activate a forecast type, Salesforce locks the filter definition that determines which opportunity records the forecast type includes. This is by design: changing filters on an active forecast type would invalidate historical forecast data and rollups, so the platform prevents it.
Adding Custom Columns Locks Forecast Settings
Custom calculated columns can be added to a forecast type at any time. However, once a custom column is added, the forecast settings become locked and can no longer be edited. Orphaned custom columns from deactivated forecast types can also cause errors when configuring forecast settings.
If you receive errors in Forecast Settings related to custom columns from old deactivated forecast types:
ForecastingType and related custom column objects to identify orphaned columns linked to deactivated forecast types.Can I edit the filter on a forecast type without recreating it?
No. Filter definitions on forecast types are immutable once the type is activated. There is no way to edit the filter without creating a new forecast type. This is a platform constraint, not a permissions issue.
I need to exclude Closed Lost opportunities from my forecast but my forecast type is already active. What are my options?
Closed Lost opportunities should be excluded from forecasts by ensuring the Opportunity Forecast Category field is set to Omitted on those records. Verify that any Closed Lost opportunities have their Forecast Category set to Omitted — this is typically driven by the stage-to-forecast-category mapping in your pipeline configuration. Have the admin check that the Closed Lost stage is correctly mapped to the Omitted forecast category in the opportunity's stage settings, so those records are automatically excluded from rollups.
I deactivated a forecast type but still see errors about its custom columns. How do I clear these?
Deactivated forecast types retain their custom column configurations and can cause errors in Forecast Settings. Use Workbench to query and delete the orphaned columns associated with the deactivated type. This is a known cleanup step after deactivating forecast types.
Considerations for Custom Calculated Columns in Pipeline Forecasts
Custom Columns Error When Editing Forecast Settings (000395092)
005321977

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.