Is the Forecast category field editable in Salesforce1?
|Knowledge Article Number||000192839|
The supported functionality of the Forecast Category field in Salesforce1.
You cannot edit the Forecast Category field, however, field values are automatically entered when you save the record (based on the value of the Stage Opportunities field).
You can manually edit the value for this field in the full Salesforce site.
You can vote for the feature enhancement request idea on the IdeaExchange: (https://success.salesforce.com/ideaView?id=08730000000DlnsAAC).