diff --git a/backend/gn_module_zh/hierarchy.py b/backend/gn_module_zh/hierarchy.py
index 70b670ed..3397895d 100644
--- a/backend/gn_module_zh/hierarchy.py
+++ b/backend/gn_module_zh/hierarchy.py
@@ -859,14 +859,14 @@ def __get_rule_name(self):
         try:
             return (
                 DB.session.execute(
-                    select(TRules, BibHierCategories)
+                    select(TRules, BibHierSubcategories)
                     .join(TRules)
                     .where(TRules.rule_id == self.rule_id)
                 )
                 .all()[0]
-                .BibHierCategories.label.capitalize()
+                .BibHierSubcategories.label.capitalize()
             )
-        except NoResultFound:
+        except:
             pass
         return (
             DB.session.execute(
diff --git a/backend/gn_module_zh/search.py b/backend/gn_module_zh/search.py
index c111c761..076b0fd0 100644
--- a/backend/gn_module_zh/search.py
+++ b/backend/gn_module_zh/search.py
@@ -105,7 +105,7 @@ def main_search(query, json):
     # --- Hierarchy search
     hierarchy = json.get("hierarchy")
     if hierarchy is not None and basin is not None:
-        query = filter_hierarchy(query, json=hierarchy, basin=basin[0].get("name"))
+        query = filter_hierarchy(query, json=hierarchy, basin=basin["name"])
 
     return query
 
diff --git a/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.html b/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.html
index 1ffed925..07ebd14c 100644
--- a/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.html
+++ b/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.html
@@ -28,6 +28,7 @@ <h5>Rubrique</h5>
           <option
             class="option-title"
             [value]="field.name"
+            disabled
           >
             {{ field.name | uppercase }}
           </option>
@@ -36,6 +37,7 @@ <h5>Rubrique</h5>
             <option
               *ngIf="cat?.name"
               [value]="cat.name"
+              [disabled]="cat.subcategory.length !== 1"
             >
               <span>&nbsp;{{ cat.name | capitalize }}</span>
             </option>
@@ -60,7 +62,6 @@ <h5>Attribut</h5>
         [parentFormControl]="localForm.controls.attributes"
         keyLabel="attribut"
         (onChange)="attributesChanged($event)"
-        [multiple]="knowledges.length"
       />
     </div>
     <div class="pr-0 col-lg-3 col-6">
diff --git a/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.ts b/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.ts
index 2121607f..60e3c53c 100644
--- a/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.ts
+++ b/frontend/app/zh-hierarchy-search/components/zh-hierarchy-search-table.component.ts
@@ -7,7 +7,7 @@ import { HierarchyField, HierarchyFields, Note, RiverBasin } from '../../models/
 import { TableColumn } from '../../commonComponents/table/table-interface';
 
 type Data = {
-  kownledges: string[];
+  knowledges: string[];
   field: string;
   attributes: string;
 };
@@ -87,7 +87,9 @@ export class ZhHierarchySearchTableComponent implements OnInit {
           this.fields = [];
           this.notes = [];
         })
-        .finally(() => {});
+        .finally(() => {
+          this.updateAttributesAndKnowledgeForm();
+        });
     }
   }
 
@@ -110,9 +112,6 @@ export class ZhHierarchySearchTableComponent implements OnInit {
   }
 
   fieldChanged(event) {
-    this.localForm.controls['attributes'].reset();
-    this.localForm.controls['knowledges'].reset();
-
     const filteredNotes = this.notes.filter(
       (item) =>
         (item.volet == event && item.rubrique == null && item.sousrubrique == null) ||
@@ -131,11 +130,29 @@ export class ZhHierarchySearchTableComponent implements OnInit {
       this.knowledges = this.getKnowledge(this.attributes[0]);
     }
 
-    if (this.attributes.length > 0) {
-      this.localForm.controls['attributes'].setValue([this.attributes[0]]);
+    // Update the form
+    this.updateAttributesAndKnowledgeForm();
+  }
+
+  updateAttributesAndKnowledgeForm() {
+    const knowledgeControl = this.localForm.controls['knowledges'];
+    const attributesControl = this.localForm.controls['attributes'];
+
+    attributesControl.reset();
+    knowledgeControl.reset();
+
+    if (this.attributes.length) {
+      attributesControl.enable();
+      attributesControl.setValue([this.attributes[0]]);
+    } else {
+      attributesControl.disable();
     }
+
     if (this.knowledges.length > 0) {
-      this.localForm.controls['knowledges'].setValue([this.knowledges[0]]);
+      knowledgeControl.enable();
+      knowledgeControl.setValue(this.knowledges[0]);
+    } else {
+      knowledgeControl.disable();
     }
   }
 
@@ -170,9 +187,17 @@ export class ZhHierarchySearchTableComponent implements OnInit {
       const form = this.initialForm();
       form.patchValue(this.localForm.value);
       this.data.push(form);
-      // Reset all form data
-      this.reset();
+      let knowledges_array = [];
+      this.data.value.forEach((element) => {
+        if (element['knowledges'] !== null && !Array.isArray(element['knowledges'])) {
+          // avoid object object in 'connaissance' column of the frontend table
+          knowledges_array.push(element['knowledges']);
+          element['knowledges'] = knowledges_array;
+          knowledges_array = [];
+        }
+      });
     }
+    this.reset();
   }
 
   onDeleteFilter(event) {
diff --git a/frontend/app/zh-hierarchy-search/zh-hierarchy-search.component.html b/frontend/app/zh-hierarchy-search/zh-hierarchy-search.component.html
index 59998786..7f27aed4 100644
--- a/frontend/app/zh-hierarchy-search/zh-hierarchy-search.component.html
+++ b/frontend/app/zh-hierarchy-search/zh-hierarchy-search.component.html
@@ -8,12 +8,12 @@ <h4>Recherche hiérarchisation</h4>
     <div class="card-body">
       <div
         class="row"
-        *ngIf="riverBasin?.value?.length > 0; else noZone"
+        *ngIf="riverBasin?.value?.code; else noZone"
       >
         <div class="col-12">
           <zh-hierarchy-search-table
             [form]="form"
-            [riverBasin]="riverBasin?.value[0]"
+            [riverBasin]="riverBasin?.value"
           ></zh-hierarchy-search-table>
         </div>
       </div>
diff --git a/frontend/app/zh-search/zh-search.component.ts b/frontend/app/zh-search/zh-search.component.ts
index 1755708f..746d995c 100644
--- a/frontend/app/zh-search/zh-search.component.ts
+++ b/frontend/app/zh-search/zh-search.component.ts
@@ -95,6 +95,8 @@ export class ZhSearchComponent implements OnInit {
   onReset() {
     this._searchService.reset();
     // Emit empty object to search all ZH
+    this.hierarchySearchToggled = false;
+    this.advancedSearchToggled = false;
     this.onSearch.emit();
   }