HI,

We've very basic requirements like

1) Once stage reached to Closed Won or Loss, which is logically and end of opportunity life cycle, Salesman should not be able to edit. 

2) Forecast category should be linked to stage. User should not allow to select Forecast category seperately

3) Closed Date validation, its should be either current date or future date, when user is Close opportunity.

Just that, we are new to Zoho and migrating from Salesforce. Just these basic valediction are not working.

will appreciate if any Zoho champions can advice on how to achieve these requirements.