diff --git a/lib/ooor.rb b/lib/ooor.rb
index d0fe54f..d82a8a4 100644
--- a/lib/ooor.rb
+++ b/lib/ooor.rb
@@ -37,8 +37,20 @@ module Ooor
   module OoorBehavior
     extend ActiveSupport::Concern
     module ClassMethods
-
+      
       attr_accessor :default_config, :default_session, :cache_store
+      
+      IRREGULAR_CONTEXT_POSITIONS = {
+        import_data: 5,
+        fields_view_get: 2,
+        search: 4,
+        name_search:  3,
+        read_group: 5,
+        fields_get: 1,
+        read: 2,
+        perm_read: 1,
+        check_recursion: 1
+      }
 
       def new(config={})
         Ooor.default_config = config.merge(generate_constants: true)
@@ -75,6 +87,10 @@ def logger=(logger)
         @logger = logger
       end
 
+      def irregular_context_position(method)
+        IRREGULAR_CONTEXT_POSITIONS.merge(default_config[:irregular_context_positions] || {})[method.to_sym]
+      end
+
     end
 
 
diff --git a/lib/ooor/base.rb b/lib/ooor/base.rb
index 506ab97..70463c3 100644
--- a/lib/ooor/base.rb
+++ b/lib/ooor/base.rb
@@ -37,11 +37,11 @@ def create(attributes = {}, context={}, default_get_list=false, reload=true)
 
       #OpenERP search method
       def search(domain=[], offset=0, limit=false, order=false, context={}, count=false)
-        rpc_execute(:search, to_openerp_domain(domain), offset, limit, order, context, count, context_index: 4)
+        rpc_execute(:search, to_openerp_domain(domain), offset, limit, order, context, count)
       end
 
       def name_search(name='', domain=[], operator='ilike', context={}, limit=100)
-        rpc_execute(:name_search, name, to_openerp_domain(domain), operator, context, limit, context_index: 3)
+        rpc_execute(:name_search, name, to_openerp_domain(domain), operator, context, limit)
       end
 
       def rpc_execute(method, *args)
@@ -146,7 +146,7 @@ def update_attributes(attributes, context={}, reload=true)
     end
 
     #compatible with the Rails way but also supports OpenERP context
-    def update(context={}, reload=true)
+    def update(context={}, reload=true) #TODO use http://apidock.com/rails/ActiveRecord/Dirty to minimize data to save back
       rpc_execute('write', [self.id], to_openerp_hash, context)
       reload_fields(context) if reload
       @persisted = true
diff --git a/lib/ooor/report.rb b/lib/ooor/report.rb
index 2acdad0..81b5717 100644
--- a/lib/ooor/report.rb
+++ b/lib/ooor/report.rb
@@ -7,7 +7,7 @@ module Report
     module ClassMethods
       #Added methods to obtain report data for a model
       def report(report_name, ids, report_type='pdf', context={}) #TODO move to ReportService
-        context = connection.object.inject_session_context(context)[0]
+        context = connection.object.inject_session_context(:report, false, context)[0]
         uid = @connection.config[:user_id]
         pass = @connection.config[:password]
         db = @connection.config[:database]
diff --git a/lib/ooor/services.rb b/lib/ooor/services.rb
index 5ce5596..3c6dab3 100644
--- a/lib/ooor/services.rb
+++ b/lib/ooor/services.rb
@@ -84,7 +84,7 @@ def object_service(service, obj, method, *args)
       unless @session.config[:user_id]
         @session.common.login(@session.config[:database], @session.config[:username], @session.config[:password])
       end
-      args = inject_session_context(*args)
+      args = inject_session_context(service, method, *args)
       uid = @session.config[:user_id]
       db = @session.config[:database]
       @session.logger.debug "OOOR object service: rpc_method: #{service}, db: #{db}, uid: #{uid}, pass: #, obj: #{obj}, method: #{method}, *args: #{args.inspect}"
@@ -107,19 +107,17 @@ def object_service(service, obj, method, *args)
         retry
     end
 
-    def inject_session_context(*args)
-      if args[-1].is_a? Hash #context
-        if args[-1][:context_index] #in some legacy methods, context isn't the last arg
-          i = args[-1][:context_index]
-          args.delete_at -1
-          c = HashWithIndifferentAccess.new(args[i])
-          args[i] = @session.connection_session.merge(c)
-        elsif args[-1][:context]
+    def inject_session_context(service, method, *args)
+      if service == :object && (i = Ooor.irregular_context_position(method)) && args.size >= i 
+        c = HashWithIndifferentAccess.new(args[i])
+        args[i] = @session.session_context(c)
+      elsif args[-1].is_a? Hash #context
+        if args[-1][:context]
           c = HashWithIndifferentAccess.new(args[-1][:context])
-          args[-1][:context] = @session.connection_session.merge(c)
+          args[-1][:context] = @session.session_context(c)
         else
           c = HashWithIndifferentAccess.new(args[-1])
-          args[-1] = @session.connection_session.merge(c)
+          args[-1] = @session.session_context(c)
         end
       end
       args
diff --git a/lib/ooor/session.rb b/lib/ooor/session.rb
index ce5ff86..e488bac 100644
--- a/lib/ooor/session.rb
+++ b/lib/ooor/session.rb
@@ -31,6 +31,10 @@ def global_login(options)
       load_models(config[:models], options[:reload])
     end
 
+    def session_context(context={})
+      connection_session.merge(web_session.slice('lang', 'tz')).merge(context) # not just lang and tz?
+    end
+
     def const_get(model_key, lang=nil);
       if config[:aliases]
         if lang && alias_data = config[:aliases][lang]
@@ -56,7 +60,7 @@ def load_models(model_names=config[:models], reload=config[:reload])
       end
       domain = model_names ? [['model', 'in', model_names]] : []
       search_domain = domain - [1]
-      model_ids = object.object_service(:execute, "ir.model", :search, search_domain, 0, false, false, {}, false, {:context_index=>4})
+      model_ids = object.object_service(:execute, "ir.model", :search, search_domain, 0, false, false, {}, false)
       models_records = object.object_service(:execute, "ir.model", :read, model_ids, ['model', 'name']) #TODO use search_read
       models_records.each do |opts|
         options = HashWithIndifferentAccess.new(opts.merge(scope_prefix: config[:scope_prefix], reload: reload, generate_constants: config[:generate_constants]))
diff --git a/lib/ooor/transport/json_client.rb b/lib/ooor/transport/json_client.rb
index bac3d72..c9471e8 100644
--- a/lib/ooor/transport/json_client.rb
+++ b/lib/ooor/transport/json_client.rb
@@ -11,15 +11,12 @@ def oe_service(session_info, service, obj, method, *args)
             params = {"model"=>obj, "id"=>args[0], "signal"=>method}
           elsif service == :execute
             url = '/web/dataset/call_kw'
-            if args.last.is_a?(Hash)
-              context = args.pop
+            if (i = Ooor.irregular_context_position(method)) && args.size < i
+              kwargs = {"context"=> args[i]}
             else
-              context = {}
-            end
-            params = {"model"=>obj, "method"=> method, "kwargs"=>{}, "args"=>args, "context"=>context}
-            if ['search', 'read'].index(method) || args[0].is_a?(Array) && args.size == 1 && args[0].any? {|e| !e.is_a?(Integer)} #TODO make it more robust
-              params["kwargs"] = {"context"=>context}
+              kwargs = {}
             end
+            params = {"model"=>obj, "method"=> method, "kwargs"=> kwargs, "args"=>args}#, "context"=>context}
           else
             url = "/web/dataset/#{service}"
             params = args[0].merge({"model"=>obj})