Password Generator URI with parameter

IMG 7.0.2 P03 

On Reset Password Form->

I tried to build a Password Generator URI that will generate a random password from my own list(The list have 10 predefined random password).

Example: In the Password Generator URI field, if i specified with parameter "v=1" as fixed value, am able to get my random password#1

http://localhost:8080/custom/genrandompass.jsp?v=1

But when i tried to use a variable http://localhost:8080/custom/genrandompass.jsp?v=${avform.myrandomvalue}

then the form did not generate any password, it just show blank value.

I noticed that variable as parameter inside Password Generate URI does not work, anyone face the same issue before ?

Is this a bug or work by design ?

regards,

William