diff --git a/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/disk/image/TransferDiskImageCommand.java b/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/disk/image/TransferDiskImageCommand.java
index 0a073c5714d..e32c6cd7985 100644
--- a/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/disk/image/TransferDiskImageCommand.java
+++ b/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/disk/image/TransferDiskImageCommand.java
@@ -12,6 +12,7 @@
 import javax.inject.Inject;
 
 import org.ovirt.engine.core.bll.CommandActionState;
+import org.ovirt.engine.core.bll.LockMessage;
 import org.ovirt.engine.core.bll.LockMessagesMatchUtil;
 import org.ovirt.engine.core.bll.NonTransactiveCommandAttribute;
 import org.ovirt.engine.core.bll.ValidationResult;
@@ -435,14 +436,21 @@ protected Map<String, Pair<String, String>> getSharedLocks() {
             // StartVmBackup should handle locks
             return locks;
         }
-        if (!Guid.isNullOrEmpty(getParameters().getImageId())) {
+        if (!Guid.isNullOrEmpty(getParameters().getImageId()) && getDiskImage() != null) {
             List<VM> vms = vmDao.getVmsListForDisk(getDiskImage().getId(), true);
             vms.forEach(vm -> locks.put(vm.getId().toString(),
-                    LockMessagesMatchUtil.makeLockingPair(LockingGroup.VM, EngineMessage.ACTION_TYPE_FAILED_VM_IS_LOCKED)));
+                    LockMessagesMatchUtil.makeLockingPair(LockingGroup.VM, getDiskIsBeingTransferredLockMessage())));
         }
+
         return locks;
     }
 
+    private String getDiskIsBeingTransferredLockMessage() {
+        return new LockMessage(EngineMessage.ACTION_TYPE_FAILED_DISK_IS_BEING_TRANSFERRED)
+                .withOptional("DiskName", getDiskImage().getDiskAlias() != null ? getDiskImage().getDiskAlias() : "")
+                .toString();
+    }
+
     @Override
     protected Map<String, Pair<String, String>> getExclusiveLocks() {
         Map<String, Pair<String, String>> locks = new HashMap<>();
@@ -452,7 +460,7 @@ protected Map<String, Pair<String, String>> getExclusiveLocks() {
         }
         if (getDiskImage() != null) {
             locks.put(getDiskImage().getId().toString(),
-                    LockMessagesMatchUtil.makeLockingPair(LockingGroup.DISK, EngineMessage.ACTION_TYPE_FAILED_DISK_IS_LOCKED));
+                    LockMessagesMatchUtil.makeLockingPair(LockingGroup.DISK, getDiskIsBeingTransferredLockMessage()));
         }
         return locks;
     }
diff --git a/backend/manager/modules/common/src/main/java/org/ovirt/engine/core/common/errors/EngineMessage.java b/backend/manager/modules/common/src/main/java/org/ovirt/engine/core/common/errors/EngineMessage.java
index 73e9c21251a..94626761daa 100644
--- a/backend/manager/modules/common/src/main/java/org/ovirt/engine/core/common/errors/EngineMessage.java
+++ b/backend/manager/modules/common/src/main/java/org/ovirt/engine/core/common/errors/EngineMessage.java
@@ -1047,6 +1047,7 @@ public enum EngineMessage {
     ACTION_TYPE_FAILED_VM_IS_HIBERNATING(ErrorType.CONFLICT),
     ACTION_TYPE_FAILED_DISK_IS_USED_FOR_CREATE_VM(ErrorType.CONFLICT),
     ACTION_TYPE_FAILED_DISK_IS_BEING_REMOVED(ErrorType.CONFLICT),
+    ACTION_TYPE_FAILED_DISK_IS_BEING_TRANSFERRED(ErrorType.CONFLICT),
     ACTION_TYPE_FAILED_OVF_DISK_IS_BEING_USED(ErrorType.CONFLICT),
     ACTION_TYPE_FAILED_UNSUPPORTED_OVF(ErrorType.CONFLICT),
     ACTION_TYPE_FAILED_DOMAIN_OVF_ON_UPDATE(ErrorType.CONFLICT),
diff --git a/frontend/webadmin/modules/frontend/src/main/resources/org/ovirt/engine/ui/frontend/AppErrors.properties b/frontend/webadmin/modules/frontend/src/main/resources/org/ovirt/engine/ui/frontend/AppErrors.properties
index 4a5f4db5055..72160dc60d0 100644
--- a/frontend/webadmin/modules/frontend/src/main/resources/org/ovirt/engine/ui/frontend/AppErrors.properties
+++ b/frontend/webadmin/modules/frontend/src/main/resources/org/ovirt/engine/ui/frontend/AppErrors.properties
@@ -141,6 +141,7 @@ ACTION_TYPE_FAILED_DISCARD_AFTER_DELETE_SUPPORTED_ONLY_BY_BLOCK_DOMAINS=Cannot $
 ACTION_TYPE_FAILED_DISK_CONFIGURATION_NOT_SUPPORTED=Cannot ${action} ${type}. Disk configuration (${volumeFormat} ${volumeType} backup-${backup}) is incompatible with the storage domain type.
 ACTION_TYPE_FAILED_DISK_HAS_SNAPSHOTS=Cannot ${action} ${type}. Disks with snapshots are not supported.
 ACTION_TYPE_FAILED_DISK_IS_BEING_EXPORTED=Cannot ${action} ${type}. Disk ${DiskAlias} is being exported.
+ACTION_TYPE_FAILED_DISK_IS_BEING_TRANSFERRED=Cannot ${action} ${type}. Disk ${DiskName} is being transferred.
 ACTION_TYPE_FAILED_DISK_IS_BEING_CONVERTED=Cannot ${action} ${type}. Disk ${DiskAlias} is being converted.
 ACTION_TYPE_FAILED_DISK_IS_BEING_MIGRATED=Cannot ${action} ${type}. Disk ${DiskName} is being moved or copied.
 ACTION_TYPE_FAILED_DISK_IMAGE_CANNOT_BE_MEASURED_WHILE_USED=Cannot measure image ${imageId}, it is being used by a VM.