To create reciprocal publications, add the transactional publication and article to each database. Note that:
USE test1
GO
  
EXEC sp_addpublication @publication = N'two_way_pub_test1', 
    @restricted = N'false', @sync_method = N'native', 
    @repl_freq = N'continuous', @description = N'publ1’, 
    @status = N'active', @allow_push = N'true', 
    @allow_pull = N'true', @allow_anonymous = N'false', 
    @enabled_for_internet = N'false', 
    @independent_agent = N'false', @immediate_sync = N'false', 
    @allow_sync_tran = N'false', 
    @autogen_sync_procs = N'false', @retention = 60, 
    @default_access = N'true'
  
EXEC sp_addpublication_snapshot 
    @publication = N'two_way_pub_test1',@frequency_type = 4, 
    @frequency_interval = 1, 
    @frequency_relative_interval = 0, 
    @frequency_recurrence_factor = 1, @frequency_subday = 1, 
    @frequency_subday_interval = 0, @active_start_date = 0,
    @active_end_date = 0, @active_start_time_of_day = 233000, 
    @active_end_time_of_day = 0
GO
  
EXEC sp_addarticle @publication = N'two_way_pub_test1',
    @article = N'two_way_test1', @source_owner = N'dbo', 
    @source_object = N'two_way_test1', 
    @destination_TABLE = N'two_way_test2', 
    @type = N'logbased', @creation_script = null, 
    @description = null, @pre_creation_cmd = N'drop', 
    @schema_option = 0x00000000000000F1, @status = 16, 
    @vertical_partition = N'false', 
    @ins_cmd = N'CALL sp_ins_two_way_test2', 
    @del_cmd = N'XCALL sp_del_two_way_test2', 
    @upd_cmd = N'XCALL sp_upd_two_way_test2', 
    @filter = null, @sync_object = null
GO
  
USE test2
GO
  
EXEC sp_addpublication @publication = N'two_way_pub_test2', 
    @restricted = N'false', @sync_method = N'native', 
    @repl_freq = N'continuous', @description = N'Pub2’,
    @status = N'active', @allow_push = N'true', 
    @allow_pull = N'true', @allow_anonymous = N'false', 
    @enabled_for_internet = N'false', 
    @independent_agent = N'false', @immediate_sync = N'false', 
    @allow_sync_tran = N'false', 
    @autogen_sync_procs = N'false', @retention = 60, 
    @default_access = N'true'
  
EXEC sp_addpublication_snapshot 
    @publication = N'two_way_pub_test2',@frequency_type = 4, 
    @frequency_interval = 1, 
    @frequency_relative_interval = 0, 
    @frequency_recurrence_factor = 1, @frequency_subday = 1, 
    @frequency_subday_interval = 0, @active_start_date = 0, 
    @active_end_date = 0, @active_start_time_of_day = 233000, 
    @active_end_time_of_day = 0
GO
  
-- Add the transactional articles in test2
EXEC sp_addarticle @publication = N'two_way_pub_test2',
    @article = N'two_way_test2', @source_owner = N'dbo', 
    @source_object = N'two_way_test2', @destination_TABLE = 
    N'two_way_test1', @type = N'logbased', 
    @creation_script = null, 
    @description = null, @pre_creation_cmd = N'drop', 
    @schema_option = 0x00000000000000F1, @status = 16, 
    @vertical_partition = N'false', 
    @ins_cmd = N'CALL sp_ins_two_way_test1', 
    @del_cmd = N'XCALL sp_del_two_way_test1', 
    @upd_cmd = N'XCALL sp_upd_two_way_test1', 
    @filter = null, @sync_object = null
GO