USE [envisage]

update ScenarioCln set SystemAttributeObjectID = '00000000-0000-0000-0000-000000000000'
where SystemAttributeObjectID is null

GO

alter table ScenarioCln alter column SystemAttributeObjectID uniqueidentifier not null
GO

if exists (select * from sys.all_objects where name like 'PK_ScenarioCln' and parent_object_id = OBJECT_ID('ScenarioCln') and type = 'PK')
begin
	ALTER TABLE dbo.ScenarioCln DROP CONSTRAINT PK_ScenarioCln
end

ALTER TABLE dbo.ScenarioCln ADD CONSTRAINT
	PK_ScenarioCln PRIMARY KEY CLUSTERED 
	(
	Id, SystemAttributeObjectID
	) WITH( STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]

GO