Enhancements as per issue tracking sheet

module/applications/sheets/base-actor-sheet.mjs

@@ -108,6 +108,9 @@ export default class OathHammerActorSheet extends HandlebarsApplicationMixin(fou
   _onDragOver(event) {}
 
   async _onDropItem(item) {
+    // Ignore drops of items already owned by this actor (internal drag = no-op)
+    if (item.parent?.id === this.document.id) return
+
     const itemData = item.toObject()
     // Class is unique: replace any existing item of the same type
     if (item.type === "class") {