alter a table from a bk file which is the publication, msg 4929

[DLu]

Hi
Need to alter a table, which is from a bk file (repl publish db).

Msg 4929, Level 16, State 1, Line 1
Cannot alter the table 'tableA' because it is being published for replication.

Look table property: table is replicated : True
This is on the SQL2005 STD sp2, no replication at all.

How could I get rid of the error to alter the table?

Thanks
David