Hello agus,
Here is an example from D365FO - in AX2012 things should work the same:
Step 1: Setup default descriptions
Here you have to setup the following 3 if you record invoices via the pending vendor invoice form.
If you use journals, you might have to look for other default descriptions or enter them manually.
I have not checked that because I never use invoice journals.

Step 2: Record invoices => the default description should automatically be there in the voucher when you post the invoice
Step 3: Make the payment against a briding account.
Here the default description from the vendor - payment, vendor default description hits in. This needs to be setup as follows:

The important thing is no 4 the 'description' field.
For no 5 you can select the voucher field.
Note: You have to use the payment proposal. If you directly select a single invoice, the description text is not inherited.
Step 4: Post the payment journal
Step 5: Open a GL journal and select the bridge posting
Step 6: Open the bank transactions and check the information posted. Here is my example where I added something like the invoice number, vendor, etc. In your case, you should see the voucher numbers that have been used.

Notes:
* If you use multiple languages, please ensure that the default descriptions are setup for all languages. I made that mistake a couple of times until I noticed my issue.
* I plan to make a blog post about this. In case you are stuck, you can have a look at the post later on but it might take a couple of weeks until I publish this one. So, take a look at my blog if you like.
Hope this helps you getting this fixed and resolved.
Best regards,
Ludwig