// id_category_default is now for multishop

admin-dev/functions.php

@@ -152,6 +152,7 @@ function getPath($urlBase, $id_category, $path = '', $highlight = '', $categoryT
 						AND c.nright >= '.(int)$category['nright'].'
 						AND cl.id_lang = '.(int)$context->language->id.
 						($home ? ' AND c.id_category='.$id_category : '').'
+						AND c.id_category != '.(int)Category::getTopCategory()->id.'
 					GROUP BY c.id_category
 					ORDER BY c.level_depth ASC
 					LIMIT '.(!$home ? (int)($category['level_depth'] + 1) : 1);

admin-dev/themes/default/template/controllers/products/associations.tpl

@@ -58,10 +58,10 @@
 			<td class="col-right">
 				<select id="id_category_default" name="id_category_default">
 					{foreach from=$selected_cat item=cat}
-						<option value="{$cat.id_category}" {if $product->id_category_default == $cat.id_category}selected="selected"{/if} >{$cat.name}</option>
+						<option value="{$cat.id_category}" {if $id_category_default == $cat.id_category}selected="selected"{/if} >{$cat.name}</option>
 					{/foreach}
 				</select>
-                <div class="hint" style="display:block;">{l s='The default category is the category who is displayed by default.'}</div>
+				<div class="hint" style="display:block;">{l s='The default category is the category who is displayed by default.'}</div>
 			</td>
 		</tr>
 	</table>