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Required fields missing in trigger error. Why?


I have created a trigger to add a custom Milestone__c object to a Case on case creation.

I have assigned values to the two required fields, which are Case__c and Start__c, but I am still get the following error when I create a Case:

REQUIRED_FIELD_MISSING, Required fields are missing: [Case, Start]: [Case, Start]: Trigger.CaseInitialiseMilestones: line 24, column 1

My trigger code is:

Trigger CaseInitialiseMilestones on Case (before insert) {

    List<RecordType> caseRTs = [SELECT Id, Name FROM RecordType];
    Map<String, Id> rtMap = new Map<String, Id>();
    for(RecordType rt : caseRTs) {
        rtMap.put(rt.Name, rt.Id);

    List<Milestone__c> NewMilestones = new List<Milestone__c>();

    for(Case c : {
        if( c.RecordTypeId == rtMap.get('Sales')) {

            DateTime caseCreation = c.CreatedDate;

            Milestone__c MASOverallResolution = new Milestone__c();
            MASOverallResolution.Start__c = caseCreation;
            MASOverallResolution.Case__c = c.Id;


    insert NewMilestones;

I'd be grateful for any explanation of why it is detecting that the required fields haven't been assigned.


Attribution to: Joe

Possible Suggestion/Solution #1

Your trigger on Case is before insert. In this context the Id and CreatedDate have not yet been set. Your trigger should operate after insert.

Attribution to: Stephen Willcock

Possible Suggestion/Solution #2

I'm not 100% sure but I think it may be the case that the Case doesn't have values for ID & CreatedDate until after the insert.

Attribution to: Davin Casey
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