[15.0] Error al generar IVA digital ventas

[FedericoLaTorre]

El error se produce al tratar de generar el IVA digital ventas, no así el de compras que lo genera sin problemas.

RPC_ERROR
Odoo Server Error
Traceback (most recent call last):
File "/opt/odoo15/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
result = request.dispatch()
File "/opt/odoo15/odoo/odoo/http.py", line 687, in dispatch
result = self._call_function(**self.params)
File "/opt/odoo15/odoo/odoo/http.py", line 359, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/opt/odoo15/odoo/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/opt/odoo15/odoo/odoo/http.py", line 348, in checked_call
result = self.endpoint(*a, **kw)
File "/opt/odoo15/odoo/odoo/http.py", line 916, in call
return self.method(*args, **kw)
File "/opt/odoo15/odoo/odoo/http.py", line 535, in response_wrap
response = f(*args, **kw)
File "/opt/odoo15/odoo/addons/web/controllers/main.py", line 1346, in call_button
action = self._call_kw(model, method, args, kwargs)
File "/opt/odoo15/odoo/addons/web/controllers/main.py", line 1334, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/opt/odoo15/odoo/odoo/api.py", line 464, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/opt/odoo15/odoo/odoo/api.py", line 451, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/opt/odoo15/sources/odoo-argentina/l10n_ar_account_iva_digital/models/account_vat_ledger.py", line 139, in compute_digital_data
cbtes = self.get_REGDIGITAL_CV_CBTE()
File "/opt/odoo15/sources/odoo-argentina/l10n_ar_account_iva_digital/models/account_vat_ledger.py", line 256, in get_REGDIGITAL_CV_CBTE
line = line + inv.currency_id.afip_code
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/opt/odoo15/odoo/odoo/http.py", line 643, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/opt/odoo15/odoo/odoo/http.py", line 301, in _handle_exception
raise exception.with_traceback(None) from new_cause
TypeError: can only concatenate str (not "bool") to str