Show current debt level for customer on receipts

[micolous]

On receipts we show the account details for transferring money when it is marked as a debt.

However it doesn't show the customer's current debt level.

Need to investigate:

• If this is already available as a variable in OBPOS
• If not, add it.

[micolous]

Looking at the code, printCurDebt is defined by com.openbravo.pos.customers.CustomerInfoExt. TicketInfo.getCustomer appears to return a CustomerInfoExt, not CustomerInfo (which lacks that metadata), so should be possible with this in the Printer.Ticket.xml:

<text>${ticket.getCustomer().printCurDebt()}</text>

Need to test this on a live database setup.