add possibility to specify a maturity date

for the membership fees

association.py

 # This file is part of Tryton. The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from decimal import Decimal
+from datetime import timedelta
 from trytond.config import config
 from trytond.i18n import gettext
 from trytond.model import Workflow, ModelView, ModelSQL, fields, Unique
@@ -286,6 +287,9 @@ class MembershipType(ModelSQL, ModelView):
  required=True,
  ondelete='RESTRICT',
  help="The revenue account that is used for the fee.")
+ maturity_delay = fields.TimeDelta("Maturity Delay",
+ required=True,
+ help="The period of time after the membership fees must be paid")
  company = fields.Many2One('company.company', 'Company', required=True,
  select=True,
  domain=[
@@ -298,6 +302,10 @@ class MembershipType(ModelSQL, ModelView):
  def default_company(cls):
  return Transaction().context.get('company')
 
+ @classmethod
+ def default_maturity_delay(cls):
+  return timedelta(0)
+
 
 class Membership(ModelSQL, ModelView):
  """Membership"""
@@ -617,13 +625,15 @@ class Fee(ModelSQL, ModelView):
  party = None
  if account.party_required:
  party = self.member.party
- else:
- party = None
+
+ maturity_date= self.period.start_date + \
+ self.period.membership_type.maturity_delay
 
  return MoveLine(
  debit=abs(amount) if amount > 0 else 0,
  credit=abs(amount) if amount < 0 else 0,
  account=account,
+ maturity_date=maturity_date,
  party=party,
  )
 

view/membership_type_form.xml

@@ -14,6 +14,8 @@ this repository contains the full copyright notices and license terms. -->
  <field name="account_revenue" />
  <label name="journal" />
  <field name="journal" />
+ <label name="maturity_delay" />
+ <field name="maturity_delay" />
  </page>
  </notebook>
 </form>
\ No newline at end of file