When attempting to change the due date on User Stories (Milestone Tasks) we're faced with this error message when editing some user stories, those user stories are ones with a dependant User Story (predecessor) . The error message is posted below.

This is the method being called by the trigger
 

public static void checkSuccessorDependencies(Map<Id, Milestone1_Task__c> oldMap, Map<Id, Milestone1_Task__c> newMap) {
        Map<Id, Set<Milestone1_Task__c>> successorMap = new Map<Id, Set<Milestone1_Task__c>>();
        for(Milestone1_Task__c successor: [SELECT Id, Start_Date__c, Due_Date__c, Predecessor_Task__c FROM Milestone1_Task__c WHERE Predecessor_Task__c IN :newMap.keySet() AND Id NOT IN :newMap.keySet()]) {
            if(!successorMap.containsKey(successor.Predecessor_Task__c)) {
                successorMap.put(successor.Predecessor_Task__c, new Set<Milestone1_Task__c>());
            }
            successorMap.get(successor.Predecessor_Task__c).add(successor);
        }
        List<Milestone1_Task__c> successorsToUpdate = new List<Milestone1_Task__c>();
        for(Milestone1_Task__c newRec : newMap.values()) {
            Milestone1_Task__c oldRec = oldMap.get(newRec.Id);
            if(oldRec.Due_Date__c != null && newRec.Due_Date__c != null) {
                Integer deadlineShift = oldRec.Due_Date__c.daysBetween(newRec.Due_Date__c);
                if(deadlineShift != 0 && successorMap.containsKey(newRec.Id)) {
                    for(Milestone1_Task__c successor: successorMap.get(newRec.Id)) {
                        successor.Start_Date__c = successor.Start_Date__c.addDays(deadlineShift);
                        successor.Due_Date__c = successor.Due_Date__c.addDays(deadlineShift);
                    }
                    successorsToUpdate.addAll(successorMap.get(newRec.Id));
                }
            }
        }
        update successorsToUpdate;
    }

 

Is it possible to create a record on a custom object 'Commit' every time a commit is made in our BitBucket repository? 

This way, we can internally see basic details of our commits and associate them with User Stories without leaving our Salesforce org. It would be great for our product owner and BAs