If you're running Spira v4.0 patch 002 or lower, you can either apply patch 003 when it becomes available or as an immediate solution:

1) Open up SQL Server Management Studio on the database server

2) Choose the "New Query" option

3) Change the database to SpiraTest / SpiraPlan / SpiraTeam and then run the following SQL command:

SET IDENTITY_INSERT TST_WORKFLOW_FIELD_STATE ON;
GO
INSERT INTO TST_WORKFLOW_FIELD_STATE
(
WORKFLOW_FIELD_STATE_ID, NAME, IS_ACTIVE
)
VALUES
(
3, 'Hidden', 1
)
GO
SET IDENTITY_INSERT TST_WORKFLOW_FIELD_STATE OFF;
GO