Program: 58910
Project: 58910
Buggy source:
public List<InvoiceLine> populate(Invoice invoice,InvoicingFolder folder) throws AxelorException {
  List<SaleOrderLine> saleOrderLineList=new ArrayList<SaleOrderLine>(folder.getSaleOrderLineSet());
  List<PurchaseOrderLine> purchaseOrderLineList=new ArrayList<PurchaseOrderLine>(folder.getPurchaseOrderLineSet());
  List<TimesheetLine> timesheetLineList=new ArrayList<TimesheetLine>(folder.getLogTimesSet());
  List<ExpenseLine> expenseLineList=new ArrayList<ExpenseLine>(folder.getExpenseLineSet());
  List<ElementsToInvoice> elementsToInvoiceList=new ArrayList<ElementsToInvoice>(folder.getElementsToInvoiceSet());
  List<ProjectTask> projectTaskList=new ArrayList<ProjectTask>(folder.getProjectTaskSet());
  List<InvoiceLine> invoiceLineList=new ArrayList<InvoiceLine>();
  invoiceLineList.addAll(saleOrderInvoiceServiceImpl.createInvoiceLines(invoice,saleOrderLineList));
  invoiceLineList.addAll(this.customerChargeBackPurchases(purchaseOrderInvoiceServiceImpl.createInvoiceLines(invoice,purchaseOrderLineList),folder));
  invoiceLineList.addAll(timesheetServiceImp.createInvoiceLines(invoice,timesheetLineList));
  invoiceLineList.addAll(this.customerChargeBackExpenses(expenseService.createInvoiceLines(invoice,expenseLineList),folder));
  invoiceLineList.addAll(elementsToInvoiceService.createInvoiceLines(invoice,elementsToInvoiceList));
  invoiceLineList.addAll(this.createInvoiceLines(invoice,projectTaskList));
  for (  InvoiceLine invoiceLine : invoiceLineList) {
    sequence+=10;
    invoiceLine.setSequence(sequence);
    invoiceLine.setSaleOrder(invoiceLine.getInvoice().getSaleOrder());
  }
  return invoiceLineList;
}

Fixed version (ground truth):
public List<InvoiceLine> populate(Invoice invoice,InvoicingFolder folder) throws AxelorException {
  List<SaleOrderLine> saleOrderLineList=new ArrayList<SaleOrderLine>(folder.getSaleOrderLineSet());
  List<PurchaseOrderLine> purchaseOrderLineList=new ArrayList<PurchaseOrderLine>(folder.getPurchaseOrderLineSet());
  List<TimesheetLine> timesheetLineList=new ArrayList<TimesheetLine>(folder.getLogTimesSet());
  List<ExpenseLine> expenseLineList=new ArrayList<ExpenseLine>(folder.getExpenseLineSet());
  List<ElementsToInvoice> elementsToInvoiceList=new ArrayList<ElementsToInvoice>(folder.getElementsToInvoiceSet());
  List<ProjectTask> projectTaskList=new ArrayList<ProjectTask>(folder.getProjectTaskSet());
  List<InvoiceLine> invoiceLineList=new ArrayList<InvoiceLine>();
  invoiceLineList.addAll(saleOrderInvoiceServiceImpl.createInvoiceLines(invoice,saleOrderLineList));
  invoiceLineList.addAll(this.customerChargeBackPurchases(purchaseOrderInvoiceServiceImpl.createInvoiceLines(invoice,purchaseOrderLineList),folder));
  invoiceLineList.addAll(timesheetServiceImp.createInvoiceLines(invoice,timesheetLineList));
  invoiceLineList.addAll(expenseService.createInvoiceLines(invoice,expenseLineList));
  invoiceLineList.addAll(elementsToInvoiceService.createInvoiceLines(invoice,elementsToInvoiceList));
  invoiceLineList.addAll(this.createInvoiceLines(invoice,projectTaskList));
  for (  InvoiceLine invoiceLine : invoiceLineList) {
    sequence+=10;
    invoiceLine.setSequence(sequence);
    invoiceLine.setSaleOrder(invoiceLine.getInvoice().getSaleOrder());
  }
  return invoiceLineList;
}