Cyclone IV EP4CE30 FBGA484 DQXX Pins for Parity missing in x9 mode group 2B and 4B

Hello All,

if i look into the "External Memory Interfaces in Cyclone IV devices ... Vol1, Chapter 7", Page 7-6, Table 7-2, there is written, the device support four x9 groups on Bottom.

But I have only found 9x DQ3B, 9x DQ5B on BANK3, 8x DQ2B and 8x DQ4B on BANK4 in the EP4CE30 PIN Excel Table.

What to do about the missing 1x DQ2B and 1 DQ4B?

In x36 mode, there are 17x DQ5B on BANK4 and 19x DQ5B on BANK3, summ 36x DQ5B, why are the Ball AB10 and AA20 are only DQxB in x18 and x36 mode but not in quad x9 mode?

Is this a mistake in the Pin List? Or in the Table in the "External Memory ..."? Or what is wrong e.g. i dont understand?

Can somebody help me?