Universal Containers (UC) has several custom Visualforce applications have been developed in which users are able to edit Opportunity records. UC…

Using a validation rule for each field that takes the Stage into consideration is the simplest approach

to handle this new requirement. A validation rule can enforce the field requirements based on the

logic and criteria that you define, and display an error message when users try to save a record that

does not meet the requirements. Updating the Opportunity page layout to mark these fields as

required will not work because page layouts do not support conditional field requirements. Updating

these Opportunity field definitions in Setup to be required will not work because it will apply to all

stages and records. Writing an Apex trigger that checks each field when records are saved is not the

simplest approach because it requires coding and testing