BSL and Data in Mass Erase Command

Hi

I just tried out the Mass Erase Command of BSL of the MSP430F2619. In the Application Note SLAU319 it says the two bytes AL and AH of the command can be any data. However, when I sent the command with both of this bytes set to 00h, the BSL didn't accept it and sent back a NACK (A0h). Now I tried a value other than zero for the AL and AH bytes, for instance 10h. Then the BSL accepted the command, sent back an ACK (90h) and executed the mass erase.

Below you can see two commands I used in hexadecimal notation:

80 18 04 04 00 00 06 A5 7D 46

80 18 04 04 10 10 06 A5 6D 56

I didn't find any hint in the Application Note that 00h for AL and AH doesn't work. Does anyone have an explanation for this behaviour?

Regards

Roman