diff --git a/blazarclient/exception.py b/blazarclient/exception.py
index 9dd5968..8aa8791 100644
--- a/blazarclient/exception.py
+++ b/blazarclient/exception.py
@@ -76,3 +76,9 @@ class IncorrectLease(BlazarClientException):
     """Occurs if lease parameters are incorrect."""
     message = _("The lease parameters are incorrect.")
     code = 409
+
+
+class DuplicatedLeaseParameters(BlazarClientException):
+    """Occurs if lease parameters are duplicated."""
+    message = _("The lease parameters are duplicated.")
+    code = 400
diff --git a/blazarclient/tests/v1/__init__.py b/blazarclient/tests/v1/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/blazarclient/tests/v1/shell_commands/__init__.py b/blazarclient/tests/v1/shell_commands/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/blazarclient/tests/v1/shell_commands/test_leases.py b/blazarclient/tests/v1/shell_commands/test_leases.py
new file mode 100644
index 0000000..2ba7a06
--- /dev/null
+++ b/blazarclient/tests/v1/shell_commands/test_leases.py
@@ -0,0 +1,110 @@
+# Copyright (c) 2017 NTT Corp.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import argparse
+import mock
+
+from blazarclient import exception
+from blazarclient import shell
+from blazarclient import tests
+from blazarclient.v1.shell_commands import leases
+
+
+class CreateLeaseTestCase(tests.TestCase):
+
+    def setUp(self):
+        super(CreateLeaseTestCase, self).setUp()
+        self.cl = leases.CreateLease(shell.BlazarShell(), mock.Mock())
+
+    def test_args2body_correct_phys_res_params(self):
+        args = argparse.Namespace(
+            start='2020-07-24 20:00',
+            end='2020-08-09 22:30',
+            events=[],
+            name='lease-test',
+            reservations=[],
+            physical_reservations=[
+                'min=1,'
+                'max=2,'
+                'hypervisor_properties='
+                '["and", [">=", "$vcpus", "2"], '
+                '[">=", "$memory_mb", "2048"]],'
+                'resource_properties='
+                '["==", "$extra_key", "extra_value"]'
+            ]
+        )
+        expected = {
+            'start': '2020-07-24 20:00',
+            'end': '2020-08-09 22:30',
+            'events': [],
+            'name': 'lease-test',
+            'reservations': [
+                {
+                    'min': '1',
+                    'max': '2',
+                    'hypervisor_properties':
+                        '["and", [">=", "$vcpus", "2"], '
+                        '[">=", "$memory_mb", "2048"]]',
+                    'resource_properties':
+                        '["==", "$extra_key", "extra_value"]',
+                    'resource_type': 'physical:host'
+                }
+            ]
+        }
+        self.assertDictEqual(self.cl.args2body(args), expected)
+
+    def test_args2body_incorrect_phys_res_params(self):
+        args = argparse.Namespace(
+            start='2020-07-24 20:00',
+            end='2020-08-09 22:30',
+            events=[],
+            name='lease-test',
+            reservations=[],
+            physical_reservations=[
+                'incorrect_param=1,'
+                'min=1,'
+                'max=2,'
+                'hypervisor_properties='
+                '["and", [">=", "$vcpus", "2"], '
+                '[">=", "$memory_mb", "2048"]],'
+                'resource_properties='
+                '["==", "$extra_key", "extra_value"]'
+            ]
+        )
+        self.assertRaises(exception.IncorrectLease,
+                          self.cl.args2body,
+                          args)
+
+    def test_args2body_duplicated_phys_res_params(self):
+        args = argparse.Namespace(
+            start='2020-07-24 20:00',
+            end='2020-08-09 22:30',
+            events=[],
+            name='lease-test',
+            reservations=[],
+            physical_reservations=[
+                'min=1,'
+                'min=1,'
+                'max=2,'
+                'hypervisor_properties='
+                '["and", [">=", "$vcpus", "2"], '
+                '[">=", "$memory_mb", "2048"]],'
+                'resource_properties='
+                '["==", "$extra_key", "extra_value"]'
+            ]
+        )
+        self.assertRaises(exception.DuplicatedLeaseParameters,
+                          self.cl.args2body,
+                          args)
diff --git a/blazarclient/v1/shell_commands/leases.py b/blazarclient/v1/shell_commands/leases.py
index 6f6c0b4..fe0be29 100644
--- a/blazarclient/v1/shell_commands/leases.py
+++ b/blazarclient/v1/shell_commands/leases.py
@@ -144,19 +144,22 @@ class CreateLease(command.CreateCommand):
                        % phys_res_str)
             phys_res_info = {"min": "", "max": "", "hypervisor_properties": "",
                              "resource_properties": ""}
-            prog = re.compile('^(\w+)=(\w+|\[[^]]+\])(?:,(.+))?$')
+            prog = re.compile('^(?:(.*),)?(%s)=(.*)$'
+                              % "|".join(phys_res_info.keys()))
 
             def parse_params(params):
                 match = prog.search(params)
                 if match:
                     self.log.info("Matches: %s", match.groups())
-                    k, v = match.group(1, 2)
-                    if k in phys_res_info:
+                    k, v = match.group(2, 3)
+                    if not phys_res_info[k]:
                         phys_res_info[k] = v
                     else:
-                        raise exception.IncorrectLease(err_msg)
-                    if len(match.groups()) == 3 and match.group(3) is not None:
-                        parse_params(match.group(3))
+                        raise exception.DuplicatedLeaseParameters(err_msg)
+                    if match.group(1) is not None:
+                        parse_params(match.group(1))
+                else:
+                    raise exception.IncorrectLease(err_msg)
 
             parse_params(phys_res_str)
             if not (phys_res_info['min'] and phys_res_info['max']):