Syntax Error Near Column

I am trying to add one column 'uc_ossi_copn' to the constraint 'usr_ossi_gcpa_timassy_pk' in table 'usr_ossi_gcpa_timassy'.   while doing so, I am receiving the following error

Incorrect Syntax Near the keyword 'column'

Please tell me what is the issue here.
alter table usr_ossi_gcpa_timassy ADD CONSTRAINT usr_ossi_gcpa_timassy_pk column(uc_ossi_opn,uc_ossi_inspec,uc_ossi_noc,uc_ossi_copn)

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Anthony PerkinsCommented:
That would be because COLUMN is not a valid clause there.  Perhaps you mean CHECK.  On the other, I have no idea what you are trying to do.
I infer from _pk that you are trying to create a primary key?
alter table usr_ossi_gcpa_timassy
ADD CONSTRAINT usr_ossi_gcpa_timassy_pk
primary key(uc_ossi_opn,uc_ossi_inspec,uc_ossi_noc,uc_ossi_copn)

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Anthony PerkinsCommented:
Good point.  That must be it.
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Microsoft SQL Server 2008

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