Free Text Invoice - Get InvoiceId before posting an Invoice with X++ in D365 or AX 2012

I came across a requirement where client asked us to display actual Invoice Id before actually posting it in the system(They needed it as per their business, they send Invoices to Customers before posting so if any amendment has to be made, it can be made directly to Order/Free text invoice and post it afterwards).

Luckily, not much change required for this.

Navigate to class CUSTPOSTINVOICE and add new method as below

// method to get/set Invoice and voucher
private container getNumAndVoucher(NumberSeq _numberSeq)
{
   container ret;
   if (custInvoiceTable.InvoiceID != '')
   {
       _numberSeq.parmNumberSequenceCode('');
       _numberSeq.parmNumberSequenceId(0);
       ret = [custInvoiceTable.InvoiceID, custInvoiceTable.Voucher];
   }
   else
   {
       ret = _numberSeq.numAndVoucher();
   }
   return ret;
}

Then, open RUNINTERNAL method of same class for editing and scroll down to the line where it says

numberSeq = this.allocateNumAndVoucher();

Then copy and comment the above line and move to next if/else condition

 if (custInvoiceTable.InvoiceId
                && RetailMCRChannelTable::findForCurrentUser().mcrEnableOrderCompletion)

and modify else part of this as shown below

  //changed, moved from line 164
       numberSeq = this.allocateNumAndVoucher();//paste commented line of code
       if (countryRegion_LTLV)
       {
            [invoiceId, voucher] = this.getNumAndVoucher_W(numberSeq);
            if (! CustInvoiceJour::checkDuplicateNum_W(invoiceId, '', custInvoiceTable.InvoiceDate))
            {
                throw error("@SYS25904");
            }
      }
      else
      {
           //new code
           [invoiceId, voucher] = this.getNumAndVoucher(numberSeq);
      }

After this, include a below piece of code(modify as per the calling place) at required place to save invoiced and voucher for posting.

// to update invoice and voucher
    Select forUpdate custInvoiceTable1 where custInvoiceTable1.RecId == custInvoiceTable.RecId;
    custPostInvoice = new CustPostInvoice(custInvoiceTable1);
    numberSeq = custPostInvoice.allocateNumAndVoucher();

    [invoice,voucher] = numberSeq.numAndVoucher();
    custInvoiceTable1.InvoiceId = invoice;
    custInvoiceTable1.Voucher = voucher;
    custInvoiceTable1.update();

Now you'll have actual invoice id in Invoice field of Free text invoice table(CustInvoiceTable) for further reporting and posting.

Share your thoughts and comments if any.