>Hi all,
>
>I have a table, to which I add a column:
>
>alter table temp.dbo.tmpdumpallprs
> add dumpprsid bigint IDENTITY(1,1) NOT NULL
>
>So the column is filled with values 1 to {nr of records}. Now I want to add a constant to the column. So I have to remove the identity property. How do I do that?

Why not create a new column for the constant? Its purpose is completely different from that of a PK. A PK should be a simple thing that is controlled by the database.