I am new to writing validation rules and am stuck.  I need to write a rule so that a person can not change a project status to active unless a picklist field called foundation type is filled out. This would only apply to projects that fall within certain departments.


 

I am trying to execute the following code for recalling an approval process an ends up getting the following error

 

 

execution of AfterUpdate caused by: System.DmlException: Process failed. First exception on row 0; first error: INVALID_OPERATION, Illegal transition type:

 

 Approval.ProcessWorkItemRequest pwr = new Approval.ProcessWorkItemRequest();
       
List<ProcessInstance> procins = new List<ProcessInstance>([select Id from ProcessInstance where Status = 'Pending' and TargetObjectId = :objectId]);
// Retrieve the process work instance id associated to the process instance
            List<ProcessInstanceWorkitem>  workitem = new List<ProcessInstanceWorkitem>([select Id from ProcessInstanceWorkitem where ProcessInstanceId = :procins[0].id]);

            if ((workitem != null) && (workitem.size() > 0))
            {
                pwr.SetComments(statusToUpdate);

                pwr.setWorkItemId(workitem[0].id);
                pwr.setAction('Remove');
            
               
                // Execute process request
                Approval.ProcessResult pr = Approval.process(pwr);

}