The primary key of A1 has two fields, the reference from C1 only has one. You need a UNIQUE index on A1_INDEX (not on A1_INDEX and something else besides). That is, the UNIQUE constraint needs to have A1_CAT removed from it.
The primary key of A1 has two fields, the reference from C1 only has one. You need a UNIQUE index on A1_INDEX (not on A1_INDEX and something else besides). That is, the UNIQUE constraint needs to have A1_CAT removed from it.