The error code -204 says:

The object name is undefined. Resolution is need to check if the DB2 object name is correct.

The error code -205 says:

Invalid column name. In other way, the column name is not defined on that table. Resolution is check if that column name is created during Table creation.

The error code -206 says:

Similar to error -204, the column name is invalid in the context of SELECT, INSERT , DELETE or MERGE