PowerConnect 7048 no enable password issue

Hi,

I'm facing an issue with PowerConnect 7048.

I'm trying to add it in my rancid, so, i would like to disable the enable password, i tried the following:

conf t
username "rancid" password 1b430c5c9deb13487f016d09e7c66fce privilege 15 encrypted
no enable password

After that, if i try a new session and type "en", i have this error:

SAASPC7048>en

Authentication failed.

SAASPC7048>

I did it on a 1524 and it works perfectly.

So, do somebody can help me to solve this cause it's driving me crazy ...

Many thanks for your help