diff --git a/django_api/serializers.py b/django_api/serializers.py
index 86ebfa7c..59f5416d 100644
--- a/django_api/serializers.py
+++ b/django_api/serializers.py
@@ -1,133 +1,133 @@
 from rest_framework import serializers
 
 from dj_rql.drf.serializers import RQLMixin
 from .models import *
 
 
 class OrgaSerializer(RQLMixin,serializers.ModelSerializer):
     
     class Meta:
         model = Organization
         fields = '__all__'
         depth = 4
 
 
 class TermSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Term
         fields = '__all__'
         depth = 4
 
 
 class ConditionSetSerializer(RQLMixin,serializers.ModelSerializer):
     term = TermSerializer(many=True, read_only=True)
     class Meta:
         model = ConditionSet
         # pre filter for rql
         # fields = ['id','condition_type','term','journal','organization']
         # add for informations purpose
         fields = '__all__'
         depth = 4
 
 
 class TermSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Term
         fields = '__all__'
         depth = 2
 
 
 class CountrySerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Country
         fields = '__all__'
         depth = 4
 
 
 class LanguageSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Language
         fields = '__all__'
         depth = 4
 
 
 class IssnSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Issn
-        fields = ['issn', 'issn_type','journal__id']
-        depth = 4
+        fields = '__all__'
+        depth = 1
 
 class JournalSerializer(RQLMixin,serializers.ModelSerializer):
     issn = IssnSerializer(required=False, source='classIssn', many=True)
     class Meta:
         model = Journal
         fields = '__all__'
         depth = 4
 
 class JournalLightSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Journal
         fields = ['id', 'name']
         depth = 1
 
 class OaSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Oa
         fields = '__all__'
         depth = 4
 
 
 class PublisherSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Publisher
         fields = '__all__'
         depth = 4
 
 
 class VersionSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Version
         fields = '__all__'
         depth = 4
 
 
 class LicenceSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Licence
         fields = '__all__'
         depth = 4
 
 
 class Cost_factor_typeSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Cost_factor_type
         fields = '__all__'
         depth = 4
 
 
 class Cost_factorSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = Cost_factor
         fields = '__all__'
         depth = 4
 
 
 class ConditionTypeSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = ConditionType
         fields = '__all__'
         depth = 4
 
 
 class OrganizationConditionSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = OrganizationCondition
         fields = '__all__'
         depth = 4
 
 
 class JournalConditionSerializer(RQLMixin,serializers.ModelSerializer):
     class Meta:
         model = JournalCondition
         fields = '__all__'
         depth = 4