HsqlDB throws exception-- trying to alter the columns from unique- primary

Hi,
I am trying to migrate my old DB Schema to a new DB schema and the underlying database is HsqlDB. One of the tables has two of its columns described as UNIQUE in the older schema, whereas they were made PRIMARY in the new schema. I went through the documentation provided by HSQL (http://www.hsqldb.org/doc/guide/ch09.html) and tried to execute the following query to alter the columns:
stmt.execute("Alter Table user_type_table add primary key (user_type_name,attribute_name)");
Somehow I get the following exception when I tried to do this:
java.sql.SQLException: Wrong data type: KEY in statement [Alter Table user_type_table add primary key]
at org.hsqldb.jdbc.jdbcUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.jdbcStatement.fetchResult(Unknown Source)
at org.hsqldb.jdbc.jdbcStatement.execute(Unknown Source)
Am i doing something wrong?

Rich,
Whichever column(s) you changed to generate the conflicts will be present in the logs anyway. Since, your prebuilt conflict handler is not set up for those columns, you end up with apply errors. You can remove those columns from being part of conflict detection by calling the DBMS_APPLY_ADM.COMPARE_OLD_VALUES procedure. Hope this helps.

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