I've figured it out, Thanks anyway.
CREATE TABLE [dbo].[EventChildren]
(
[EventId] [uniqueidentifier] NOT NULL,
[EventChildId] [uniqueidentifier] NOT NULL,
[Enabled] [bit] NOT NULL,
CONSTRAINT [EventEvents] PRIMARY KEY CLUSTERED
(
[EventId] ASC,
[EventChildId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
ALTER TABLE [dbo].[EventChildren] WITH CHECK ADD CONSTRAINT [FK_EventChildren_Event] FOREIGN KEY([EventId])
REFERENCES [dbo].[Event] ([step_id])
GO
ALTER TABLE [dbo].[EventChildren] WITH CHECK ADD CONSTRAINT [FK_EventChildren_EventChild] FOREIGN KEY([EventChildId])
REFERENCES [dbo].[Event] ([step_id])
GO
ALTER TABLE [dbo].[EventChildren] CHECK CONSTRAINT [FK_EventChildren_Event]
GO
ALTER TABLE [dbo].[EventChildren] CHECK CONSTRAINT [FK_EventChildren_EventChild]
GO