diff --git a/app-openbis-command-line/src/python/obis/dm/commands/collection.py b/app-openbis-command-line/src/python/obis/dm/commands/collection.py
index 3a82e8a8e14f36ad1e4f8ff4dfb23050b5a7f0c7..2bac8694d4adc6046707a8242191d036fb041313 100644
--- a/app-openbis-command-line/src/python/obis/dm/commands/collection.py
+++ b/app-openbis-command-line/src/python/obis/dm/commands/collection.py
@@ -53,11 +53,14 @@ class Collection(OpenbisCommand):
         for perm_id in dataset_perm_ids:
             ds = self.get_dataset(perm_id)
             datasets += [ds] if ds is not None and ds.sample is None else []
-        datasets = set(datasets)
-        for dataset in datasets:
-            experiment = dataset.experiment
-            click_echo(
-                f"Collection: {experiment.permId} '{self.prop}' = {experiment.props[self.prop]}")
+        if not datasets:
+            click_echo(f"No parent collections found.")
+        else:
+            datasets = set(datasets)
+            for dataset in datasets:
+                experiment = dataset.experiment
+                click_echo(
+                    f"Collection: {experiment.permId} '{self.prop}' = {experiment.props[self.prop]}")
         return 0
 
     def set(self):
@@ -66,13 +69,16 @@ class Collection(OpenbisCommand):
         for perm_id in dataset_perm_ids:
             ds = self.get_dataset(perm_id)
             datasets += [ds] if ds is not None and ds.sample is None else []
-        datasets = set(datasets)
-        for dataset in datasets:
-            experiment = dataset.experiment
-            experiment.props[self.prop] = self.value
-            click_echo(
-                f"Setting collection: {experiment.permId} property '{self.prop}' to '{experiment.props[self.prop]}'")
-            experiment.save()
+        if not datasets:
+            click_echo(f"No parent collections found.")
+        else:
+            datasets = set(datasets)
+            for dataset in datasets:
+                experiment = dataset.experiment
+                experiment.props[self.prop] = self.value
+                click_echo(
+                    f"Setting collection: {experiment.permId} property '{self.prop}' to '{experiment.props[self.prop]}'")
+                experiment.save()
         return 0
 
     def empty_or_split(self):
diff --git a/app-openbis-command-line/src/python/obis/dm/commands/download_physical.py b/app-openbis-command-line/src/python/obis/dm/commands/download_physical.py
index 43f084b5f3eefed1f5006cdaded57b06ec6394ad..4d12d11f838c49923383f9ddd95566abe8cbe24c 100644
--- a/app-openbis-command-line/src/python/obis/dm/commands/download_physical.py
+++ b/app-openbis-command-line/src/python/obis/dm/commands/download_physical.py
@@ -42,5 +42,5 @@ class DownloadPhysical(OpenbisCommand):
         files = self.files if self.files is not None else data_set.file_list
 
         with cd(self.data_mgmt.invocation_path):
-            target_folder = data_set.download(files)
+            target_folder = data_set.download(files, destination=self.data_mgmt.invocation_path)
             return CommandResult(returncode=0, output="Files downloaded to: %s" % target_folder)
diff --git a/app-openbis-command-line/src/python/obis/dm/commands/object.py b/app-openbis-command-line/src/python/obis/dm/commands/object.py
index 1e6517330b44d0a0e9d34472fe3a7a7d6f17b830..72e0691865a4708f55d16b48433e97eed04a9a81 100644
--- a/app-openbis-command-line/src/python/obis/dm/commands/object.py
+++ b/app-openbis-command-line/src/python/obis/dm/commands/object.py
@@ -53,10 +53,13 @@ class Object(OpenbisCommand):
         for perm_id in dataset_perm_ids:
             ds = self.get_dataset(perm_id)
             datasets += [ds] if ds is not None and ds.sample is not None else []
-        datasets = set(datasets)
-        for dataset in datasets:
-            sample = dataset.sample
-            click_echo(f"Object: {sample.permId} '{self.prop}' = {sample.props[self.prop]}")
+        if not datasets:
+            click_echo(f"No parent objects found.")
+        else:
+            datasets = set(datasets)
+            for dataset in datasets:
+                sample = dataset.sample
+                click_echo(f"Object: {sample.permId} '{self.prop}' = {sample.props[self.prop]}")
         return 0
 
     def set(self):
@@ -65,22 +68,25 @@ class Object(OpenbisCommand):
         for perm_id in dataset_perm_ids:
             ds = self.get_dataset(perm_id)
             datasets += [ds] if ds is not None and ds.sample is not None else []
-        datasets = set(datasets)
-        for dataset in datasets:
-            sample = dataset.sample
-            if self.prop == "parents":
-                sample.parents = self.empty_or_split()
-                click_echo(
-                    f"Setting object: {sample.permId} parents to {self.empty_or_split()}")
-            elif self.prop == "children":
-                sample.children = self.empty_or_split()
-                click_echo(
-                    f"Setting object: {sample.permId} children to {self.empty_or_split()}")
-            else:
-                sample.props[self.prop] = self.value
-                click_echo(
-                    f"Setting object: {sample.permId} property '{self.prop}' to '{sample.props[self.prop]}'")
-            sample.save()
+        if not datasets:
+            click_echo(f"No parent objects found.")
+        else:
+            datasets = set(datasets)
+            for dataset in datasets:
+                sample = dataset.sample
+                if self.prop == "parents":
+                    sample.parents = self.empty_or_split()
+                    click_echo(
+                        f"Setting object: {sample.permId} parents to {self.empty_or_split()}")
+                elif self.prop == "children":
+                    sample.children = self.empty_or_split()
+                    click_echo(
+                        f"Setting object: {sample.permId} children to {self.empty_or_split()}")
+                else:
+                    sample.props[self.prop] = self.value
+                    click_echo(
+                        f"Setting object: {sample.permId} property '{self.prop}' to '{sample.props[self.prop]}'")
+                sample.save()
         return 0
 
     def empty_or_split(self):