>Does anyone know why a seek(value,table,index) would cause a "uniqueness of index" error.
>The index is the PK. Table is buffered. I thought the uniqueness error was only if it was being updated.
>Isn't the seek just a optimized lookup? The table's PK has a related table.

Is the table record-level buffered? If yes, then seek will cause a record movement and if you added a new record, it will try to commit it.

Try using INDEXSEEK instead or use table-buffering (buffering = 5)