--- In ib-support@y..., Martijn Tonies <martijn@b...> wrote:

> A common cause for this error is have an index defined on a primary

key

> column. In this case, the index was created by the system - namely

because

> of the FK from LEVERANCIER to RELATIE.
>
> Dropping this FK results in removing the index and the second FK

(from

> ORDERREGEL to LEVERANCIER) could be created without problems. Next

up:

> creating the FK from LEVERANCIER to RELATIE. All went well...
>
> It is a workaround for a strange problem -- comments, anyone?
>
> (IB 6.0, NT4)

^^^^^

Martijn, best workaround for this problem is Firebird :) Ann fixed
it somewhere between RC1 and RC2.

Best regards.