src/apps/actor/base-sheet.js

@@ -457,27 +457,6 @@ export class DS4ActorSheet extends ActorSheet {
 
     this.actor.updateEmbeddedDocuments("Item", updates);
   }
-
-  /**
-   * @param {DragEvent} event
-   * @param {object} data
-   * @override
-   */
-  async _onDropItem(event, data) {
-    const item = await Item.implementation.fromDropData(data);
-    if (item && !this.actor.canOwnItemType(item.type)) {
-      notifications.warn(
-        getGame().i18n.format("DS4.WarningActorCannotOwnItem", {
-          actorName: this.actor.name,
-          actorType: this.actor.type,
-          itemName: item.name,
-          itemType: item.type,
-        }),
-      );
-      return false;
-    }
-    return super._onDropItem(event, data);
-  }
 }
 
 /**

src/hooks/hooks.ts

@@ -4,12 +4,14 @@
 
 import { registerForHotbarDropHook } from "./hotbar-drop";
 import { registerForInitHook } from "./init";
+import { registerForPreCreateItemHook } from "./pre-create-item";
 import { registerForReadyHook } from "./ready";
 import { registerForRenderHooks } from "./render";
 import { registerForSetupHook } from "./setup";
 
 export function registerForHooks(): void {
   registerForHotbarDropHook();
+  registerForPreCreateItemHook();
   registerForInitHook();
   registerForReadyHook();
   registerForRenderHooks();

src/hooks/pre-create-item.js

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2023 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
+import { notifications } from "../ui/notifications.js";
+import { getGame } from "../utils/utils.js";
+
+export function registerForPreCreateItemHook() {
+  Hooks.on("preCreateItem", preCreateItem);
+}
+
+/**
+ * @param {import('../documents/item/item.js').DS4Item} item
+ * @returns {void | false}
+ */
+function preCreateItem(item) {
+  if (item.parent instanceof Actor && !item.parent.canOwnItemType(item.type)) {
+    notifications.warn(
+      getGame().i18n.format("DS4.WarningActorCannotOwnItem", {
+        actorName: item.actor.name,
+        actorType: item.actor.type,
+        itemName: item.name,
+        itemType: item.type,
+      }),
+    );
+    return false;
+  }
+}