Solution:

Add a new ProjTable variable to the classDeclaration of the Report ProjInvoice: it will be used to store the value of our currently printed Project.

Create a method on table ProjInvoiceJour to get the ProjId for the currently printed Project Invoice. In this scenario we suppose no Project Invoices are made over multiple Projects, so there is a one to one link between a Project Invoice and a Project (which is not an obligation in Dynamics AX).

display ProjId projId()
{
  ProjInvoiceItem projInvoiceItem;
  ProjInvoiceEmpl projInvoiceEmpl;
  ProjInvoiceCost projInvoiceCost;
  ProjInvoiceRevenue projInvoiceRevenue;
  ProjInvoiceOnAcc projInvoiceOnAcc;
  ProjId projId = '';
  ;

  while select projInvoiceEmpl
    where projInvoiceEmpl.ProjInvoiceId == 
                        this.ProjInvoiceId
    && projInvoiceEmpl.InvoiceDate == this.InvoiceDate
  {
    if (projId && projId != projInvoiceEmpl.ProjId)
      return "";
    projId = projInvoiceEmpl.ProjId;
  }

  while select projInvoiceItem
    where projInvoiceItem.ProjInvoiceId == 
                        this.ProjInvoiceId
    && projInvoiceItem.InvoiceDate == this.InvoiceDate
  {
    if (projId && projId != projInvoiceItem.ProjId)
      return "";
    projId = projInvoiceItem.ProjId;
  }

  while select projInvoiceCost
    where projInvoiceCost.ProjInvoiceId == 
                        this.ProjInvoiceId
    && projInvoiceCost.InvoiceDate == this.InvoiceDate
  {
    if (projId && projId != projInvoiceCost.ProjId)
      return "";
    projId = projInvoiceCost.ProjId;
  }

  while select projInvoiceRevenue
    where projInvoiceRevenue.ProjInvoiceId == 
                           this.ProjInvoiceId
    && projInvoiceRevenue.InvoiceDate == this.InvoiceDate
  {
    if (projId && projId != projInvoiceRevenue.ProjId)
      return "";
    projId = projInvoiceRevenue.ProjId;
  }

  while select projInvoiceOnAcc
    where projInvoiceOnAcc.ProjInvoiceId == 
                         this.ProjInvoiceId
    && projInvoiceOnAcc.InvoiceDate == this.InvoiceDate
  {
    if (projId && projId != projInvoiceOnAcc.ProjId)
      return "";
    projId = projInvoiceOnAcc.ProjId;
  }

  return projId;
}

Call this method in the fetch of the Report ProjInvoice.

...
projInvoiceTable = ProjInvoiceTable::find(
        projInvoiceJour.ProjInvoiceProjId);
// BGN Get ProjId for the ProjInvoiceJour
projTable = ProjTable::find(projInvoiceJour.projId());

projFormLetterReport.loadPrintSettings(
// END
...

Create a method printLinkedDocuments in the Report ProjInvoice.

void printLinkedDocuments()
{
  #WinAPI
  DocuRef docuRef;
  ;
  while select docuRef
  where docuRef.RefCompanyId == projTable.dataAreaId
    && docuRef.RefTableId == tableNum(ProjTable)
    && docuRef.RefRecId == projTable.RecId
  {
    if(docuRef.RecId)
    {
      if (element.printJobSettings().getTarget() ==
          PrintMedium::Printer)
      {
        WinAPI::shellExecute(docuRef.completeFileName(),
          element.printJobSettings().printerPrinterName(),
          ‘’,
          #ShellExePrint);
      }
    }    
  }
} 

Call this method in the fetch method of the ProjInvoice Report.

...
this.printDocumentHeader();
this.send(formLetterRemarks);
// BGN Print documents linked with document handling
this.printLinkedDocuments();
// END

if (element.page() != 1)
{
...

When printing the ProjInvoice Report to a Printer, the linked documents will be printed too: the linked documents will be printed on the default Windows printer of the user.

Solution: override executeSection method in PageHeader

You can print the ranges with some X++ code modifications in your report.

1. Add a PageHeader control to the Report, if there isn’t yet such a control in your Report.
2. Override the executeSection method of the PageHeader control as follows:
   

   
   public void executeSection()
   {
     // BGN Printing ranges
     SysReportRun locSysReportRun;
     ;
     //END
   
     super();
   
     // BGN Printing ranges
     locSysReportRun = element;
     locSysReportRun.printRanges(true);
     SysReportRun::executePrintRangeSection(element);
     // END
   }