## -8030: Column must be indexed

### Explanation:

No index was created on the specified column.

In a referential CONSTRAINT definition, the columns (referenced_column) must designate either the key of the table or columns which form an index defined with UNIQUE.

### User Action:

You can display a list of existing indexes using a QUERY statement based on the DOMAIN.INDEXES system table. Create the required index, or else do not use any index.