diff --git a/lib/modules/asset/AssetService.ts b/lib/modules/asset/AssetService.ts
index c2509421..4013460a 100644
--- a/lib/modules/asset/AssetService.ts
+++ b/lib/modules/asset/AssetService.ts
@@ -144,13 +144,26 @@ export class AssetService extends DigitalTwinService {
     request: KuzzleRequest,
   ): Promise<KDocument<AssetContent>> {
     const asset = await this.get(engineId, assetId, request);
-
+    const unknownMetadata = {};
     for (const key in metadata) {
       if (key in asset._source.metadata) {
         asset._source.metadata[key] = metadata[key];
+      } else {
+        unknownMetadata[key] = metadata[key];
+      }
+    }
+    // ? If metadata key is unknown on the asset we check that it exists in the assetModel mappings
+    if (Object.keys(unknownMetadata).length > 0) {
+      const assetModel = await ask<AskModelAssetGet>(
+        "ask:device-manager:model:asset:get",
+        { engineGroup: engineId.split("-")[1], model: asset._source.model },
+      );
+      for (const key in unknownMetadata) {
+        if (key in assetModel.asset.metadataMappings) {
+          asset._source.metadata[key] = unknownMetadata[key];
+        }
       }
     }
-
     const updatedPayload = await this.app.trigger<EventAssetUpdateBefore>(
       "device-manager:asset:update:before",
       { asset, metadata },