OCI-43921
invalid collation for cluster column
Cause
An attempt was made to create an index cluster in which one of the key columns had an unsupported declared collation or an attempt was made to create a hash cluster in which a key column with SORT clause had an unsupported declared collation. Only the collations BINARY, USING_NLS_COMP, USING_NLS_SORT, USING_NLS_SORT_CS, USING_NLS_SORT_VAR1, and USING_NLS_SORT_VAR1_CS are supported for character columns in index clusters and for sorted character columns of hash clusters.
Action
Use one of the supported collations for the offending column.