<offer id="{goods.GOODS_MOD_ID}" available="{% IF goods.GOODS_MOD_REST_VALUE > 0 %}true{% ELSE %}false{% ENDIF %}"{% IF SHOP_OFFER_BID %} bid="{SHOP_OFFER_BID}"{% ENDIF %}{% IF SHOP_OFFER_CBID %} cbid="{SHOP_OFFER_CBID}"{% ENDIF %}> <url>{goods.URL}</url>
после него вставьте:
{% IF goods.GOODS_MOD_REST_VALUE > 0 %}<min-quantity>{goods.GOODS_MOD_REST_VALUE | number_format("0",","," ")}</min-quantity>{% ENDIF %}