jQuery Grid Plugin - jqGrid

I,

I'm using version 3.7.2 and i'm having problem with unformat for currency format.

Here is formater's colModel used :

formatter:'currency', formatoptions:{decimalSeparator:".", thousandsSeparator: " ", decimalPlaces: 2, prefix: "", suffix: " $  "}

However, when I enter the input field on edit, the suffix is still there. I tried with the default french one config, and it's not working at all too.

Thanks,

Antoine