diff --git a/data/schema/units/abilities.cfg b/data/schema/units/abilities.cfg
index c8d24ba4353..cffdb78dd42 100644
--- a/data/schema/units/abilities.cfg
+++ b/data/schema/units/abilities.cfg
@@ -88,6 +88,8 @@
 	max=infinite
 	super="units/unit_type/abilities/~generic~"
 	{SIMPLE_KEY value f_int}
+	{SIMPLE_KEY add f_int}
+	{SIMPLE_KEY sub f_int}
 	{FILTER_TAG "filter_weapon" weapon ()}
 	{FILTER_TAG "filter_second_weapon" weapon ()}
 [/tag]
diff --git a/data/test/scenarios/test_add_or_sub_in_leadership.cfg b/data/test/scenarios/test_add_or_sub_in_leadership.cfg
new file mode 100644
index 00000000000..770cfd4b6b0
--- /dev/null
+++ b/data/test/scenarios/test_add_or_sub_in_leadership.cfg
@@ -0,0 +1,153 @@
+# This unit test is used for verify the work of abilities used like weapons, but also of special_id_active attribute.
+# Here, the teacher and student are the same unit
+
+{GENERIC_UNIT_TEST "test_add_or_sub_in_leadership_abilities" (
+#define FILTER_BOB
+[filter_student]
+    [filter_weapon]
+        type=blade
+    [/filter_weapon]
+[/filter_student]
+[filter_opponent]
+    race=elf
+    [filter_weapon]
+        special_id_active=test_cth #for testing if special_id_active work with abilities used like weapons
+    [/filter_weapon]
+[/filter_opponent]
+#enddef
+#define FILTER_ALICE
+[filter_student]
+    [filter_weapon]
+        type=blade,pierce
+    [/filter_weapon]
+[/filter_student]
+[filter_opponent]
+    race=orc
+[/filter_opponent]
+#enddef
+    [event]
+        name=start
+        [modify_unit]
+            [filter]
+            [/filter]
+            max_hitpoints=100
+            hitpoints=100
+            attacks_left=1
+        [/modify_unit]
+        [object]
+            silent=yes
+            [effect]
+                apply_to=new_ability
+                [abilities]
+                    [leadership]
+                        id=leadership_neg
+                        sub=50
+                        cumulative=no
+                        affect_self=yes
+                    [/leadership]
+                    [attacks]
+                        value=1
+                        {FILTER_BOB}
+                    [/attacks]
+                    [damage]
+                        value=60
+                        {FILTER_BOB}
+                    [/damage]
+                    [chance_to_hit]
+                        value=100
+                        {FILTER_BOB}
+                    [/chance_to_hit]
+                [/abilities]
+            [/effect]
+            [filter]
+                id=bob
+            [/filter]
+        [/object]
+        [object]
+            silent=yes
+            [effect]
+                apply_to=new_ability
+                [abilities]
+                    [leadership]
+                        id=leadership_pos
+                        add=25
+                        cumulative=no
+                        affect_self=yes
+                    [/leadership]
+                    [attacks]
+                        value=1
+                        {FILTER_ALICE}
+                    [/attacks]
+                    [damage]
+                        value=60
+                        {FILTER_ALICE}
+                    [/damage]
+                    [chance_to_hit]
+                        id=test_cth
+                        value=100
+                        {FILTER_ALICE}
+                    [/chance_to_hit]
+                [/abilities]
+            [/effect]
+            [filter]
+                id=alice
+            [/filter]
+        [/object]
+
+        [store_unit]
+            [filter]
+                id=alice
+            [/filter]
+            variable=a
+            kill=yes
+        [/store_unit]
+        [store_unit]
+            [filter]
+                id=bob
+            [/filter]
+            variable=b
+        [/store_unit]
+        [unstore_unit]
+            variable=a
+            find_vacant=yes
+            x,y=$b.x,$b.y
+        [/unstore_unit]
+        [store_unit]
+            [filter]
+                id=alice
+            [/filter]
+            variable=a
+        [/store_unit]
+
+        [do_command]
+            [attack]
+                weapon=0
+                defender_weapon=0
+                [source]
+                    x,y=$a.x,$a.y
+                [/source]
+                [destination]
+                    x,y=$b.x,$b.y
+                [/destination]
+            [/attack]
+        [/do_command]
+        [store_unit]
+            [filter]
+                id=alice
+            [/filter]
+            variable=a
+        [/store_unit]
+        [store_unit]
+            [filter]
+                id=bob
+            [/filter]
+            variable=b
+        [/store_unit]
+        {ASSERT ({VARIABLE_CONDITIONAL a.hitpoints equals 70})}
+        {ASSERT ({VARIABLE_CONDITIONAL b.hitpoints equals 25})}
+        {SUCCEED}
+    [/event]
+)}
+
+#undef FILTER_BOB
+#undef FILTER_ALICE
diff --git a/wml_test_schedule b/wml_test_schedule
index b81e9968ef8..c745cd140b0 100644
--- a/wml_test_schedule
+++ b/wml_test_schedule
@@ -265,6 +265,7 @@
 0 swarm_disables_upgrades_with_abilities_adjacent_fail
 0 swarm_disables_upgrades_with_abilities_adjacent_leadership
 0 swarm_disables_upgrades_with_abilities_adjacent_leadership_fail
+0 test_add_or_sub_in_leadership_abilities
 0 unslowable_status_test
 0 unpetrifiable_status_test
 0 test_force_chance_to_hit_macro