/// <summary>
 /// Returns all rejection invoices in a list
 /// </summary>
 /// <param name="rejectionFile"></param>
 /// <returns></returns>
 private List<Invoice> GetInvoices(FlatRejectionFile rejectionFile)
 {
     List<Invoice> rejections = new List<Invoice>();
     int batchSequenceNumber = 1;
     foreach (List<FlatRejectionRecord> flatRejectionFileInvoice in rejectionFile.GetInvoices())
     {
         rejections.Add(GetInvoice(flatRejectionFileInvoice, batchSequenceNumber));
         batchSequenceNumber += 1;
     }
     return rejections;
 }