Hi Guys, i have a after insert trigger on the Case object to auto-update some fields.

Besides that, i have one validation rule to make sure a Date/Time field value not earlier than the record created Date/Time.

According to salesforce rule of "Triggers and Order of Execution", the user-defined validation rules run before the 'after  insert' trigger. However, they seems conflict with each other now for my trigger and validation rule.

My after insert trigger Code:

trigger triggerOnCase on Case(after insert){
//Declarations
set<id> caseIds = new set<id>();
set<id> userIds = new set<id>();
Long BHPerDay = 24;
BusinessHours stdBH = [select id from businesshours where isDefault = true];

if(trigger.isAfter&&trigger.isInsert){   

 
for(integer x=0; x<trigger.newMap.size();x++){
       caseIds.add(trigger.new[x].id);
       userIds.add(trigger.new[x].ownerId);       
    }
    
map<id, Case> caseMap = new map<id, Case>([select  id,
                                                   ownerId,//Case Owner Role
                                                   owner.type,
                                                   Case_Owner_Role__c,
                                                   Priority, //Expected Closed Date
                                                   CreatedDate,
                                                   Expected_Closed_Date__c

from case where id in: caseIds]);
map<id, User> userMap = new map<id, User>([select u.id, u.UserRole.Name from User u where u.Id in :userIds]);
for(id i:caseIds){

Case newCase = caseMap.get(i);

//store case owner role
newCase.Case_Owner_Role__c = userMap.get(newCase.ownerId).UserRole.Name;

//Assign Expected Closed Date

if(newCase.Priority == 'Low'){
newCase.Expected_Closed_Date__c = BusinessHours.add(stdBH.id, newCase.CreatedDate, 3*BHPerDay*3600*1000L);}
if(newCase.Priority == 'High'){
newCase.Expected_Closed_Date__c = BusinessHours.add(stdBH.id, newCase.CreatedDate, 7*BHPerDay*3600*1000L);}
if(newCase.Priority == 'Special'){
newCase.Expected_Closed_Date__c = BusinessHours.add(stdBH.id, newCase.CreatedDate, 7*BHPerDay*3600*1000L);}
    }
    update caseMap.values();

}

}

My validation rule is as follows:

OR(( Call_Back_Date_Time__c < CreatedDate )&&NOT(ISCHANGED( Call_Back_Date_Time__c )), (Call_Back_Date_Time__c < NOW())&&ISCHANGED(Call_Back_Date_Time__c))

when I inserted a new record, i key in a date/time earlier than current time, it should display the error message like "Please ensure that Call Back Date/Time is later than the current Date ."

Instead, I get the follow one:

Error: Invalid Data.
Review all error messages below to correct your data.
Apex trigger triggerOnCase caused an unexpected exception, contact your administrator: triggerOnCase: execution of AfterInsert caused by: System.DmlException: Update failed. First exception on row 0 with id 50090000002ure0AAA; first error: FIELD_CUSTOM_VALIDATION_EXCEPTION, Please ensure that Call Back Date/Time is later than the current Date & Time: [Call_Back_Date_Time__c]: Trigger.triggerOnCase: line 144, column 5

I don't know how to add try catch operation on the map. I tried the following to replace the " update caseMap.values();"

try{update caseMap.values();}
   catch(System.DmlException e){for (Integer i = 0; i < e.getNumDml(); i++) {
    eMessage = e.getDmlMessage(i);
   
    Case errorCase = [select id from Case where id =:e.getDmlId(i)];
   errorCase.addError(eMessage);

}}

while it threw me with another error message " System.FinalException: SObject row does not allow errors".

Anyone can help?