I want to display separator for the 'Quantity' field in the report. It works fine for the amount. Here is the code for it: t-esc-options='{"widget": "monetary", "display_currency": "o.currency_id"}' .

Now, If I use the same code  with removing  "display currency" key from above code (because Quantity does not need to show currency symbol) then it gives me the error while printing report:

display = self.pool['ir.qweb'].eval_object(options['display_currency'], qwebcontext)

QWebException: "display_currency" while evaluating

"translate_doc(doc_id, doc_model, 'partner_id.lang', 'account.report_invoice_document')"

If I use with "display_currency" key then it prints without error but the problem is currency symbol in Quantity field. Is there any way to display separator in PDF?