Cannot buy 'egg' from NPC

[CastorFlynn]

The item appears correctly in the trade window, looking like the ID is correct too, but when trying to buy nothing happens, no error message.

items.xml

    <item id="2695" article="an" name="egg" plural="eggs">
        <attribute key="weight" value="30" />
    </item>

npc.xml

<?xml version="1.0" encoding="UTF-8"?>
<npc name="Norma" script="Norma.lua" walkinterval="2000" floorchange="0">
    <health now="100" max="100" />
    <look type="136" head="78" body="76" legs="72" feet="96" addons="2" />
    <parameters>
        <parameter key="module_shop" value="1" />
        <parameter key="shop_buyable" value="wine,2006,10,15;bread,2689,3;cheese,2696,5;egg,2695,2;mug of wine,2012,3,15;mug of beer,2012,3,3;mug of milk,2012,2,6;mug of lemonade,2012,2,5;party cake,6280,50;" />
    </parameters>
</npc>

items.otb