خطای There are no primary or candidate keys in the referenced table 'xxx' that match the

[resident]

سلام
دستور زیر رو نوشتم که relation بین دو جدول رو برقرار کنم

ALTER TABLE [Cost]  WITH CHECK ADD  CONSTRAINT [FK_Cost_CostSubCategory] FOREIGN KEY([CostSubCategoryID])

REFERENCES [CostSubCategory] ([CostSubCategoryID])

GO



ALTER TABLE [Cost] CHECK CONSTRAINT [FK_Cost_CostSubCategory]

GO

خطای زیر رو دارم.

There are no primary or candidate keys in the referenced table 'CostSubCategory' that match the referencing column list in the foreign key 'FK_Cost_CostSubCategory'.

.

چرا؟