Table Partioning With Computed Column

This full version of this reporting table will have about 12 million row for each of three years. Prior years will be in separate partitions and frozen but the current year will be reloaded each night by source_key, probably in parallel.

I am trying to do this with a computed column but I can't slide the partition back into the main table due to an apparent problem with the Check constraint. I have tried everything I can think of and still can't get it to work.

I hope I am missing something simple. Anyone know why this does not work or how to fix it?

ALTER TABLE SWITCH statement failed. Check constraints or partition function of source table 'db_template.dbo.foo_year_source_partition_test_stage' allows values that are not allowed by check constraints or partition function on target table 'db_template.dbo.foo_year_source_partition_test'.

------------------------------------------------------------
CREATE PARTITION SCHEME zzYearSourcePScheme
AS
PARTITION zzYearSourceRangePFN
TO
(
[fg_template_0],
[fg_template_0],
[fg_template_0],
[fg_template_0],
[fg_template_0]
)
go

CREATE TABLE [dbo].[foo_year_source_partition_test](
[detail_date] [datetime] NULL,
[source_key] [int] NULL,
[year_source] AS ((CONVERT([char](2),right(datepart(year,[detail_date]),2),0)+'-')
+right('0000'+CONVERT([varchar](3),[source_key],0),(3))) PERSISTED,
[ys_id] int identity (1,1)
) ON zzYearSourcePScheme(year_source)
go

create unique clustered index ix_year_source_ys_id on [foo_year_source_partition_test] ([year_source], [ys_id]) ON zzYearSourcePScheme(year_source)
go

insert into [foo_year_source_partition_test] values('20060131',2)
insert into [foo_year_source_partition_test] values('20060131',3)
insert into [foo_year_source_partition_test] values('20060131',4)

SELECT *, $PARTITION.zzYearSourceRangePFN(year_source) AS Partition from [foo_year_source_partition_test] order by detail_date
go

CREATE TABLE [dbo].[foo_year_source_partition_test_stage](
[detail_date] [datetime] NULL,
[source_key] [int] NULL,
[year_source] AS ((CONVERT([char](2),right(datepart(year,[detail_date]),2),0)+'-')
+right('0000'+CONVERT([varchar](3),[source_key],0),(3))) PERSISTED,
[ys_id] int identity (1,1)
) --on same one ON YearSourcePScheme(year_source)

create unique clustered index ix_year_source_ys_id
on [foo_year_source_partition_test_stage] ([year_source], [ys_id]) --ON YearSourcePScheme(year_source)


ALTER TABLE db_template.dbo.foo_year_source_partition_test
SWITCH PARTITION 3 to db_template.dbo.[foo_year_source_partition_test_stage]

TRUNCATE TABLE db_template.dbo.[foo_year_source_partition_test_stage]


ALTER TABLE db_template.dbo.foo_year_source_partition_test_stage
WITH CHECK
ADD CONSTRAINT CK_foo_year_source_partition_test_stage_YearSource
CHECK
(
[year_source] = '06-003'
)

insert into foo_year_source_partition_test_stage values('20060202',3)
insert into foo_year_source_partition_test_stage values('20060303',3)
insert into foo_year_source_partition_test_stage values('20060404',3)
insert into foo_year_source_partition_test_stage values('20060505',3)

ALTER TABLE db_template.dbo.foo_year_source_partition_test_stage
SWITCH TO db_template.dbo.foo_year_source_partition_test PARTITION 3