diff --git a/module/item-sheet.js b/module/item-sheet.js
index 1a92be79..0a2302b0 100644
--- a/module/item-sheet.js
+++ b/module/item-sheet.js
@@ -250,9 +250,9 @@ export class RdDItemSheet extends ItemSheet {
   /* -------------------------------------------- */
 
   /** @override */
-  _updateObject(event, formData) { // Deprecated en v0.8 à clarifier    
+  _updateObject(event, formData) {
     // Données de bonus de cases ?
-    formData = RdDItemSort.buildBonusCaseStringFromFormData(formData);
+    formData['system.bonuscase'] = RdDItemSort.buildBonusCaseStringFromFormData(formData.bonusValue, formData.caseValue);
 
     return this.item.update(formData);
   }
diff --git a/module/item-sort.js b/module/item-sort.js
index 5047cc23..befbb6b0 100644
--- a/module/item-sort.js
+++ b/module/item-sort.js
@@ -63,26 +63,21 @@ export class RdDItemSort extends Item {
   /** Met à jour les données de formulaire 
    * si static des bonus de cases sont présents 
    * */
-  static buildBonusCaseStringFromFormData( formData ) {
-    if ( formData.bonusValue ) {
+  static buildBonusCaseStringFromFormData( bonuses, cases ) {
+    if ( bonuses ) {
       let list = [];
       let caseCheck = {};
-      for(let i=0; i<formData.bonusValue.length; i++) {
-        let coord = formData.caseValue[i] || 'A1';
-        coord = coord.toUpperCase();
-        if ( TMRUtility.verifyTMRCoord( coord  ) ) { // Sanity check
-          let bonus = formData.bonusValue[i] || 0;
-          if ( bonus > 0 && caseCheck[coord] == undefined ) {
-            caseCheck[coord] = bonus;
-            list.push( coord+":"+bonus );  
-          }
+      for (let i=0; i<bonuses.length; i++) {
+        let coord = cases[i]?.toUpperCase() || 'A1';
+        let bonus = bonuses[i] || 0;
+        if ( TMRUtility.verifyTMRCoord( coord ) && bonus > 0 && caseCheck[coord] == undefined ) {
+          caseCheck[coord] = bonus;
+          list.push( coord+":"+bonus );
         }
       }
-      formData.bonusValue = undefined; 
-      formData.caseValue  = undefined; 
-      formData.system.bonuscase = list.toString(); // Reset
+      return list.toString();
     }
-    return formData;
+    return undefined;
   }
   
   /* -------------------------------------------- */