-768 AN AUXILIARY TABLE ALREADY EXISTS FOR THE SPECIFIED COLUMN OR PARTITION

Explanation
 An attempt was made to create an auxiliary table,
but an auxiliary table for the specified column or partition already
exists. When the base table belongs to a non-partitioned table space,
there can be only one auxiliary table per LOB column of the table.
When the base table belongs to a partitioned table space, for any
given LOB column,  all values of the LOB column for a given partition
are stored in their own auxiliary table. There must be one auxiliary
table per partition of the base table space.

System action
 The statement cannot be processed.

Programmer response
 Check that the correct table name, column
name, and if applicable, partition number have been specified. If
the existing auxiliary table needs to have a different name, execute
the RENAME TABLE statement to rename the auxiliary table.

SQLSTATE
 560A5