diff --git a/src/api/endpoints/class-tainacan-rest-item-metadata-controller.php b/src/api/endpoints/class-tainacan-rest-item-metadata-controller.php
index 206a8503b..869ddf47e 100644
--- a/src/api/endpoints/class-tainacan-rest-item-metadata-controller.php
+++ b/src/api/endpoints/class-tainacan-rest-item-metadata-controller.php
@@ -161,7 +161,13 @@ class TAINACAN_REST_Item_Metadata_Controller extends TAINACAN_REST_Controller {
 			$field = $this->field_repository->fetch( $field_id );
 
 			$item_metadata = new Entities\Item_Metadata_Entity( $item, $field );
-			$item_metadata->set_value( $value );
+			if($item_metadata->is_multiple()) {
+				$item_metadata->set_value( $value );
+			} elseif(is_array($value)) {
+				$item_metadata->set_value(implode(' ', $value));
+			} else{
+				$item_metadata->set_value($value);
+			}
 
 			if ( $item_metadata->validate() ) {
 				$field_updated = $this->item_metadata_repository->update( $item_metadata );
diff --git a/src/classes/entities/class-tainacan-item-metadata-entity.php b/src/classes/entities/class-tainacan-item-metadata-entity.php
index 760936768..ad2f0fb70 100644
--- a/src/classes/entities/class-tainacan-item-metadata-entity.php
+++ b/src/classes/entities/class-tainacan-item-metadata-entity.php
@@ -180,6 +180,11 @@ class Item_Metadata_Entity extends Entity {
                 return false;
             }
         } else {
+
+            if( is_array($value) ){
+                $this->add_error('not_multiple', $field->get_name() . ' do not accept array as value');
+                return false;
+            }
             
             if ($this->is_collection_key()) {
             	$Tainacan_Items = new \Tainacan\Repositories\Items();
@@ -198,9 +203,7 @@ class Item_Metadata_Entity extends Entity {
                     return false;
                 }
             }
-            
-            // TODO: call fieldType validation
-            // 
+
             $this->set_as_valid();
             return true;   
         }   
diff --git a/src/classes/tainacan-creator.php b/src/classes/tainacan-creator.php
index fa4ef6c44..24407120e 100644
--- a/src/classes/tainacan-creator.php
+++ b/src/classes/tainacan-creator.php
@@ -88,7 +88,6 @@ $Tainacan_Fields->register_field_type('Tainacan\Field_Types\Numeric');
 $Tainacan_Fields->register_field_type('Tainacan\Field_Types\Selectbox');
 $Tainacan_Fields->register_field_type('Tainacan\Field_Types\Relationship');
 $Tainacan_Fields->register_field_type('Tainacan\Field_Types\Radio');
-$Tainacan_Fields->register_field_type('Tainacan\Field_Types\Checkbox');
 
 global $Tainacan_Filters;
 $Tainacan_Filters = new \Tainacan\Repositories\Filters();