permission issue with temp db

the following SQL works fine in SQL2000 but gets a permissions error when run on SQL2005:

IF not exists (SELECT * FROM tempdb.dbo.sysindexes WHERE NAME = 'PK_tblGuidContractMove')

BEGIN

IF @.DEBUG = 1 PRINT 'airsp_CopyContracts.PK_tblGuidContractMove'

EXECUTE('ALTER TABLE #tblGuidContractMove ALTER COLUMN guidSource GUID NOT NULL')

EXECUTE('ALTER TABLE #tblGuidContractMove ALTER COLUMN guidDestination GUID NOT NULL')

EXECUTE('ALTER TABLE #tblGuidContractMove ALTER COLUMN guidContractMove GUID NOT NULL')

EXECUTE('ALTER TABLE #tblGuidContractMove WITH NOCHECK ADD

CONSTRAINT [PK_tblGuidContractMove] PRIMARY KEY CLUSTERED

(

[guidSource],

[guidDestination],

[guidContractMove]

) ON [PRIMARY]')

END

The user permissions are set the same in both 2000 and 2005 can you please explain what changed and what are the minimum permissions need for the user to be able to make these changes to the temporary table which the user created.

Can you post a repro and the exact error message. 'alter table' right must be granted on the table for the user to change the meta data.