diff --git a/test/test_option_calculation.py b/test/test_option_calculation.py
index e2e6b01..2db667d 100644
--- a/test/test_option_calculation.py
+++ b/test/test_option_calculation.py
@@ -489,6 +489,96 @@ def test_callback_master_and_slaves_master2():
     assert cfg.val1.val2 == ['val2']
 
 
+def test_callback_master_and_slaves_master_mandatory():
+    val = StrOption('val', "", default='val')
+    val1 = StrOption('val1', "", multi=True, callback=return_value2, callback_params={'': ((val, False),)}, properties=('mandatory',))
+    val3 = StrOption('val3', "", multi=True, callback=return_value2, callback_params={'': ((val1, False),)}, properties=('mandatory',))
+    val4 = StrOption('val4', "", multi=True, callback=return_value2, callback_params={'': ((val1, False),)}, properties=('mandatory',))
+    interface1 = OptionDescription('val1', '', [val1, val3, val4])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [val, interface1])
+    cfg = Config(maconfig)
+    cfg.read_only()
+    assert cfg.val1.val3 == ['val']
+    assert cfg.val1.val4 == ['val']
+    assert cfg.val1.val1 == ['val']
+    cfg.read_write()
+    cfg.val1.val1.append('val3')
+    cfg.read_only()
+    assert cfg.val1.val1 == ['val', 'val3']
+    assert cfg.val1.val3[0] == 'val'
+    raises(PropertiesOptionError, 'cfg.val1.val3[1]')
+    raises(PropertiesOptionError, 'cfg.val1.val4[1]')
+
+
+def test_callback_master_and_slaves_master_mandatory2():
+    val = StrOption('val', "", default='val')
+    val_ = StrOption('val_', "", default='val_')
+    val1 = StrOption('val1', "", multi=True, callback=return_value2, callback_params={'': ((val, False),), 'val': ((val_, False),)}, properties=('mandatory',))
+    val3 = StrOption('val3', "", multi=True, callback=return_value2, callback_params={'': ((val1, False),), 'val': ((val_, False),)}, properties=('mandatory',))
+    val4 = StrOption('val4', "", multi=True, callback=return_value2, callback_params={'': ((val1, False),), 'val': ((val_, False),)}, properties=('mandatory',))
+    interface1 = OptionDescription('val1', '', [val1, val3, val4])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [val, val_, interface1])
+    cfg = Config(maconfig)
+    cfg.read_only()
+    assert cfg.val1.val3 == ['val', 'val_']
+    assert cfg.val1.val4 == ['val', 'val_']
+    assert cfg.val1.val1 == ['val', 'val_']
+    cfg.read_write()
+    cfg.val1.val1.append('val3')
+    assert cfg.val1.val1 == ['val', 'val_', 'val3']
+    cfg.read_only()
+    assert cfg.val1.val3[:2] == ['val', 'val_']
+    assert cfg.val1.val4[:2] == ['val', 'val_']
+    raises(PropertiesOptionError, "cfg.val1.val3[2]")
+    raises(PropertiesOptionError, "cfg.val1.val4[2]")
+    assert cfg.val1.val1 == ['val', 'val_', 'val3']
+
+
+def test_callback_master_and_slaves_master_mandatory3():
+    val = StrOption('val', "", default='val')
+    val_ = StrOption('val_', "", default='val_')
+    val1 = StrOption('val1', "", multi=True, callback=return_value2, callback_params={'': ((val, False),), 'val': ((val_, False),)}, properties=('mandatory',))
+    val3 = StrOption('val3', "", multi=True, callback=return_value, callback_params={'': ((val1, False),)}, properties=('mandatory',))
+    val4 = StrOption('val4', "", multi=True, callback=return_value, callback_params={'': ((val1, False),)}, properties=('mandatory',))
+    interface1 = OptionDescription('val1', '', [val1, val3, val4])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [val, val_, interface1])
+    cfg = Config(maconfig)
+    cfg.read_only()
+    assert cfg.val1.val3 == ['val', 'val_']
+    assert cfg.val1.val4 == ['val', 'val_']
+    assert cfg.val1.val1 == ['val', 'val_']
+    cfg.read_write()
+    cfg.val1.val1.append('val3')
+    cfg.read_only()
+    assert cfg.val1.val3 == ['val', 'val_', 'val3']
+    assert cfg.val1.val4 == ['val', 'val_', 'val3']
+    assert cfg.val1.val1 == ['val', 'val_', 'val3']
+
+
+def test_callback_master_and_slaves_master_mandatory4():
+    val = StrOption('val', "", default='val')
+    val1 = StrOption('val1', "", multi=True, callback=return_value2, callback_params={'': ((val, False),)}, properties=('mandatory',))
+    val3 = StrOption('val3', "", multi=True, callback=return_value, callback_params={'': ((val1, False),)}, properties=('mandatory',))
+    val4 = StrOption('val4', "", multi=True, callback=return_value, callback_params={'': ((val1, False),)}, properties=('mandatory',))
+    interface1 = OptionDescription('val1', '', [val1, val3, val4])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [val, interface1])
+    cfg = Config(maconfig)
+    cfg.read_only()
+    assert cfg.val1.val3 == ['val']
+    assert cfg.val1.val4 == ['val']
+    assert cfg.val1.val1 == ['val']
+    cfg.read_write()
+    cfg.val1.val1.append('val3')
+    cfg.read_only()
+    assert cfg.val1.val1 == ['val', 'val3']
+    assert cfg.val1.val3 == ['val', 'val3']
+    assert cfg.val1.val4 == ['val', 'val3']
+
+
 def test_callback_master_and_slaves_master3():
     val1 = StrOption('val1', "", multi=True, properties=('mandatory', 'empty'))
     val2 = StrOption('val2', "", multi=True, default_multi='val2', properties=('expert',))
diff --git a/tiramisu/value.py b/tiramisu/value.py
index bc6ed70..c886aa1 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -71,6 +71,8 @@ class Values(object):
                 if opt.impl_is_submulti() and submulti_index is undefined and \
                         (len(value) == 0 or not isinstance(value[0], list)):
                     return value
+                if not opt.impl_is_submulti() and len(value) > index:
+                    return value[index]
             else:
                 return value
         if with_meta: