applying ced and pokoli's suggestion

configuration.py

@@ -2,6 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.model import ModelView, ModelSQL, ModelSingleton, fields
 from trytond.pyson import Eval
+from trytond.pool import Pool
+
 from trytond.modules.company.model import (CompanyMultiValueMixin,
                                            CompanyValueMixin)
 
@@ -21,6 +23,11 @@ class Configuration(
             ],
             help="Used to generate the number given to association members."))
 
+    @classmethod
+    def default_member_sequence(cls, **pattern):
+        return getattr(
+            cls.multivalue_model('member_sequence'),
+            'default_member_sequence', lambda: None)()
 
 class MemberSequence(ModelSQL, CompanyValueMixin):
     """Member Configuration Sequence"""
@@ -33,3 +40,12 @@ class MemberSequence(ModelSQL, CompanyValueMixin):
             ('code', '=', 'association.member'),
         ],
         depends=['company'])
+
+    @classmethod
+    def default_member_sequence(cls):
+        pool = Pool()
+        ModelData = pool.get('ir.model.data')
+        try:
+            return ModelData.get_id('association', 'sequence_member')
+        except KeyError:
+            return None
\ No newline at end of file

configuration.xml

@@ -23,9 +23,4 @@ this repository contains the full copyright notices and license terms. -->
             <field name="group" ref="group_association_admin"/>
         </record>
     </data>
-    <data noupdate="1">
-        <record model="association.configuration.member_sequence" id="configuration_member_sequence">
-            <field name="member_sequence" ref="sequence_member"/>
-        </record>
-    </data>
 </tryton>

membership.py

@@ -124,6 +124,10 @@ class Membership(ModelSQL, ModelView):
 
     del _states, _depends
 
+    @classmethod
+    def default_member_state(cls):
+        return 'draft'
+
     @classmethod
     def validate(cls, memberships):
         super().validate(memberships)
@@ -162,6 +166,8 @@ class Membership(ModelSQL, ModelView):
     def on_change_with_member_state(self, name=None):
         if self.member:
             return self.member.state
+        else:
+            return 'draft'
 
     @fields.depends('member', '_parent_member.join_date')
     def on_change_with_member_join_date(self, name=None):
@@ -284,15 +290,10 @@ class Fee(ModelSQL, ModelView):
     paid = fields.Function(fields.Boolean('paid'), 'is_paid')
     reconciled = fields.Function(fields.Date("Reconciled"), 'get_reconciled')
     amount = fields.Function(fields.Numeric("Amount", fee_digit),
-        'on_change_with_amount')
+        'on_change_with_amount', searcher='search_amount')
 
     del _states
 
-    @fields.depends('period', '_parent_period.amount')
-    def on_change_with_amount(self, name=None):
-        if self.period:
-            return self.period.amount
-
     @classmethod
     def __setup__(cls):
         super().__setup__()
@@ -300,7 +301,7 @@ class Fee(ModelSQL, ModelView):
 
         cls._sql_constraints = [
             ('code_uniq', Unique(table, table.member, table.period),
-            gettext('association.msg_period_unique'))
+             "The periods for each member must be unique.")
         ]
 
         cls._buttons.update({
@@ -312,6 +313,11 @@ class Fee(ModelSQL, ModelView):
             },
         })
 
+    @fields.depends('period', '_parent_period.amount')
+    def on_change_with_amount(self, name=None):
+        if self.period:
+            return self.period.amount
+
     @fields.depends('move', '_parent_move.state')
     def on_change_with_move_state(self, name=None):
         if self.move:
@@ -329,6 +335,10 @@ class Fee(ModelSQL, ModelView):
     def default_company(cls):
         return Transaction().context.get('company')
 
+    @classmethod
+    def search_amount(cls, name, clause):
+        return [('period.amount',) + tuple(clause[1:])]
+
     def get_reconciled(self, name):
         def get_reconciliation(line):
             if line.reconciliation and line.reconciliation.delegate_to:

message.xml

@@ -21,9 +21,6 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_party_receivable_missing">
             <field name="text">The party "%(party)s" doesn't have an account receivable defined.</field>
         </record>
-        <record model="ir.message" id="msg_period_unique">
-            <field name="text">The periods for each member must be unique.</field>
-        </record>
         <record model="ir.message" id="msg_overlapping_membership">
             <field name="text">The membership "%(first)s" overlaps with the period "%(second)s".</field>
         </record>

tests/scenario_member.rst

@@ -41,19 +41,23 @@ Create chart of accounts::
     >>> receivable = accounts['receivable']
     >>> payable = accounts['payable']
     >>> revenue = accounts['revenue']
-    >>> expense = accounts['expense']
-    >>> account_tax = accounts['tax']
     >>> account_cash = accounts['cash']
 
 Create party::
 
     >>> Party = Model.get('party.party')
     >>> party = Party(name='Party')
-    >>> party.account_payable = payable
     >>> party.account_receivable = receivable
     >>> party.save()
 
 Create memberships::
+
+   >>> def periodgen(startDate,deltaTime,quantity):
+   ...   firstDate = startDate
+   ...   for period in range(quantity):
+   ...      lastDate = firstDate + deltaTime
+   ...      yield (firstDate,lastDate)
+   ...      firstDate = lastDate + datetime.timedelta(days=1)
    >>> Journal = Model.get('account.journal')
    >>> Move = Model.get('account.move')
    >>> journal_revenue, = Journal.find([
@@ -68,8 +72,14 @@ Create memberships::
    >>> start_date = datetime.date.today()
    >>> timedelta = datetime.timedelta(weeks=4)
    >>> fiscalMonth = 13
-   >>> datedeltas = [(start_date + timedelta*(n-1) + datetime.timedelta(days=1),start_date + timedelta*n,f"period {n}") for n in range(1,fiscalMonth+1)]
-   >>> periods = [ membership.periods.new(start_date=period[0],end_date=period[1], name=period[2], amount=Decimal(42)) for period in datedeltas ]
+   >>> periods = []
+   >>> for period in periodgen(start_date,timedelta,fiscalMonth):
+   ...   newPeriod = membership.periods.new(
+   ...      start_date=period[0],
+   ...      end_date=period[1],
+   ...      name="test",
+   ...      amount=Decimal(42))
+   ...   periods.append(newPeriod)
    >>> membership.save()
 
 Create member::
@@ -102,7 +112,7 @@ Test memebrship fee::
 
    >>> Period = Model.get('association.membership.period')
    >>> Fee = Model.get('association.membership.fee')
-   >>> period, = Period.find(["name","=","period 1"])
+   >>> period = Period.find([])[0]
    >>> fee = Fee(member=member,period=period)
    >>> fee.save() #doctest: +IGNORE_EXCEPTION_DETAIL
    Traceback (most recent call last):
@@ -120,7 +130,7 @@ Test memebrship fee move::
 
    >>> Period = Model.get('association.membership.period')
    >>> Fee = Model.get('association.membership.fee')
-   >>> period, = Period.find(["name","=","period 1"])
+   >>> period = Period.find([])[0]
    >>> fee = Fee(member=member,period=period)
    >>> fee.save()
    >>> fee.click('post_move')

tests/scenario_membership_fee.rst

@@ -115,3 +115,14 @@ Create fee lines::
    >>> len(Fee.find([])) > 0
    True
 
+Post fee::
+
+   >>> postedFee = Fee.find([('amount','>','0.0')])[0]
+   >>> postedFee.click('post_move')
+   >>> amount = postedFee.amount
+   >>> receivable.reload()
+   >>> amount == receivable.debit
+   True
+   >>> revenue.reload()
+   >>> amount == revenue.credit
+   True

tryton.cfg

 [tryton]
 version=5.3.0
 depends:
-    ir
+    account
     company
+    ir
     party
-    account
 xml:
     member.xml
-    configuration.xml
     membership.xml
     message.xml
+    configuration.xml

view/membership_period_form.xml

@@ -4,12 +4,13 @@ this repository contains the full copyright notices and license terms. -->
 <form>
     <label name="membership_type"/>
     <field name="membership_type"/>
+    <newline/>
     <label name="name"/>
     <field name="name" />
+    <label name="amount"/>
+    <field name="amount"/>
     <label name="start_date"/>
     <field name="start_date" />
     <label name="end_date"/>
     <field name="end_date" />
-    <label name="amount"/>
-    <field name="amount"/>
 </form>
\ No newline at end of file