I am trying to write a validation rule to prevent the stages of an opportunity from being changed, but when the stagename Verified is selected, a picklist field named Client__c is enabled for user to make a selection.

The Client__c field is then disabled (or ability for user not to edit and save record, when the StageName is no longer Client__c (the stageName progresses to the next Stage). 

I'm new and any help is appreciated. 


if certain cycle time fields are blank. For example if date of request and date of approval are blank; stage can not move from prospecting

I am trying to write a validation rule to prevent the stages of an opportunity from being changed, but when the stagename Verified is selected, a picklist field named Client__c is enabled for user to make a selection.

The Client__c field is then disabled (or ability for user not to edit and save record, when the StageName is no longer Client__c (the stageName progresses to the next Stage). 

I'm new and any help is appreciated. 


if certain cycle time fields are blank. For example if date of request and date of approval are blank; stage can not move from prospecting