Redefine violation message for new promotions

Hi, I am extending a default promotion that comes with Hybris and I want to change the default violation message shown. I added a new key for my promotion in

core-locales_en.properties

Like this

type.neworderrestriction.violationmessage.defaultvalue=Voucher is {0} valid for an order value above {1}.

However no matter what I do (initialize, update), the message is not shown (it always show the message from the top class). What I am doing wrong ?