They have been moved to the base class
from django import forms
from django.shortcuts import render
from django.template import Template, Context
-from django.db.models import Sum
from urllib.parse import urlencode
from postgresqleu.util.payment.banktransfer import BaseManagedBankPayment
from postgresqleu.util.payment.banktransfer import BaseManagedBankPaymentForm
-from postgresqleu.invoices.models import Invoice, BankTransferFees
+from postgresqleu.invoices.models import Invoice
class BackendCMutuelForm(BaseManagedBankPaymentForm):