Hello,

I was trying to create a report for an app created with Odoo studio.

When I was trying to add a monetary field in the report table, I got this error :

Expected singleton: res.currency()
Traceback (most recent call last):
  File "/home/odoo/src/odoo/13.0/odoo/models.py", line 5101, in ensure_one
    _id, = self._ids
ValueError: not enough values to unpack (expected 1, got 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/qweb.py", line 333, in _compiled_fn
    return compiled(self, append, new, options, log)
  File "<template>", line 1, in template_studio_report_document_8844
  File "<template>", line 28, in foreach_8843
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/ir_qweb.py", line 382, in _get_field
    content = converter.record_to_html(record, field_name, field_options)
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/ir_qweb_fields.py", line 464, in record_to_html
    return super(MonetaryConverter, self).record_to_html(record, field_name, options)
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/ir_qweb_fields.py", line 128, in record_to_html
    return False if value is False else record.env[self._name].value_to_html(value, options=options)
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/ir_qweb_fields.py", line 434, in value_to_html
    formatted_amount = lang.format(fmt, display_currency.round(value),
  File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/res_currency.py", line 133, in round
    self.ensure_one()
  File "/home/odoo/src/odoo/13.0/odoo/models.py", line 5104, in ensure_one
    raise ValueError("Expected singleton: %s" % self)
ValueError: Expected singleton: res.currency()

Error to render compiling AST
ValueError: Expected singleton: res.currency()
Template: studio_report_document

Please advice