I have two validation rules. I've not been able to combine the two rules into one.
One rule: Only system admin should be able to click a check box called 'new order' when an opportunity is already assigned an owner.
Second rule: Prevent users from unchecking the 'new order' checkbox if already checked true.
Here are the two separate rules that works separately that I have done:
AND(IsNewOrder__c = TRUE, NOT ISBLANK( AssignedTo__c ), $Profile.Name <> 'System Administrator')
AND( ISCHANGED(IsNewOrder__c), PRIORVALUE(IsNewOrder__c) = true, $Profile.Name <> 'System Administrator')
Any help to combine these two into one would be much appreciated.