Wondering if anyone has seen this on their statement before...

The posted date is 30 JUL 2010
The description is D/D NAB 15/07/10
Debit amount is $150.00

Now what I found bizzarre is the description.

Does anyone know what D/D NAB means and why the date would be on the description?

It is odd because:

1. It looks like a withdrawal.
2. I cant remember debiting that amount from what I pressume from the NAB part in the description means at a NAB ATM
3. Why would it have the date in the description like that? Normally if something didnt come out of my account on the date of transaction it would be listed in the "effective date" column not the description.
4. It has never taken more than 4 days for an amount previously debited to suddenly show up on my account and normally ATM withdrawals would be instant appearances on my account (only choosing the credit/debit option on my card interferes with the date that some transactions will actually take the amount of money out of my account. This is 15 days later!!

Just find it odd.