diff --git a/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/ParsingErrorCheck.json b/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/ParsingErrorCheck.json
index 307bd8ab..279b2c17 100644
--- a/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/ParsingErrorCheck.json
+++ b/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/ParsingErrorCheck.json
@@ -2939,36 +2939,6 @@
   "sqlrf/annotations_clause-5.sql" : [
     3
   ],
-  "sqlrf/boolean_and_agg-2.sql" : [
-    4
-  ],
-  "sqlrf/boolean_and_agg-3.sql" : [
-    4
-  ],
-  "sqlrf/boolean_and_agg-4.sql" : [
-    4
-  ],
-  "sqlrf/boolean_and_agg-5.sql" : [
-    4
-  ],
-  "sqlrf/boolean_and_agg-6.sql" : [
-    4
-  ],
-  "sqlrf/boolean_or_agg-2.sql" : [
-    4
-  ],
-  "sqlrf/boolean_or_agg-3.sql" : [
-    4
-  ],
-  "sqlrf/boolean_or_agg-4.sql" : [
-    4
-  ],
-  "sqlrf/boolean_or_agg-5.sql" : [
-    4
-  ],
-  "sqlrf/boolean_or_agg-6.sql" : [
-    4
-  ],
   "sqlrf/constraint-1.sql" : [
     10
   ],
diff --git a/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/SameConditionCheck.json b/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/SameConditionCheck.json
new file mode 100644
index 00000000..febd04d7
--- /dev/null
+++ b/zpa-checks/src/integrationTest/resources/expected/oracle-database_23/SameConditionCheck.json
@@ -0,0 +1,9 @@
+{
+  "sqlrf/boolean_and_agg-6.sql" : [
+    2,
+    2
+  ],
+  "sqlrf/boolean_or_agg-6.sql" : [
+    2
+  ]
+}
\ No newline at end of file
diff --git a/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/ConditionsGrammar.kt b/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/ConditionsGrammar.kt
index 0bf71a9c..a5835705 100644
--- a/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/ConditionsGrammar.kt
+++ b/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/ConditionsGrammar.kt
@@ -22,6 +22,7 @@ package org.sonar.plugins.plsqlopen.api
 import com.felipebz.flr.grammar.GrammarRuleKey
 import org.sonar.plsqlopen.sslr.PlSqlGrammarBuilder
 import org.sonar.plugins.plsqlopen.api.PlSqlGrammar.CONCATENATION_EXPRESSION
+import org.sonar.plugins.plsqlopen.api.PlSqlGrammar.NULL_LITERAL
 import org.sonar.plugins.plsqlopen.api.PlSqlGrammar.OBJECT_REFERENCE
 import org.sonar.plugins.plsqlopen.api.PlSqlKeyword.*
 
@@ -39,6 +40,7 @@ enum class ConditionsGrammar : GrammarRuleKey {
 
     // conditions
     RELATIONAL_CONDITION,
+    BOOLEAN_TEST_CONDITION,
     LIKE_CONDITION,
     BETWEEN_CONDITION,
     MULTISET_CONDITION,
@@ -71,6 +73,10 @@ enum class ConditionsGrammar : GrammarRuleKey {
                 CONCATENATION_EXPRESSION, RELATIONAL_OPERATOR, CONCATENATION_EXPRESSION
             ).skip()
 
+            b.rule(BOOLEAN_TEST_CONDITION).define(
+                CONCATENATION_EXPRESSION, IS, b.optional(NOT), b.firstOf(NULL_LITERAL, TRUE, FALSE)
+            )
+
             b.rule(LIKE_CONDITION).define(
                 CONCATENATION_EXPRESSION,
                 b.optional(NOT), LIKE,
@@ -244,6 +250,7 @@ enum class ConditionsGrammar : GrammarRuleKey {
             b.rule(CONDITION).define(
                 b.firstOf(
                     RELATIONAL_CONDITION,
+                    BOOLEAN_TEST_CONDITION,
                     LIKE_CONDITION,
                     BETWEEN_CONDITION,
                     MULTISET_CONDITION,
diff --git a/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/PlSqlGrammar.kt b/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/PlSqlGrammar.kt
index 82bd317a..b32a4554 100644
--- a/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/PlSqlGrammar.kt
+++ b/zpa-core/src/main/kotlin/org/sonar/plugins/plsqlopen/api/PlSqlGrammar.kt
@@ -793,7 +793,6 @@ enum class PlSqlGrammar : GrammarRuleKey {
 
             b.rule(POSTFIX_EXPRESSION).define(OBJECT_REFERENCE,
                     b.optional(b.firstOf(
-                            b.sequence(IS, b.optional(NOT), NULL_LITERAL),
                             ANALYTIC_CLAUSE,
                             b.sequence(KEEP_CLAUSE, b.optional(ANALYTIC_CLAUSE))))).skipIfOneChild()
 
diff --git a/zpa-core/src/test/kotlin/org/sonar/plugins/plsqlopen/api/expressions/OtherExpressionTest.kt b/zpa-core/src/test/kotlin/org/sonar/plugins/plsqlopen/api/expressions/OtherExpressionTest.kt
index d2c95505..d8857fc8 100644
--- a/zpa-core/src/test/kotlin/org/sonar/plugins/plsqlopen/api/expressions/OtherExpressionTest.kt
+++ b/zpa-core/src/test/kotlin/org/sonar/plugins/plsqlopen/api/expressions/OtherExpressionTest.kt
@@ -68,6 +68,26 @@ class OtherExpressionTest : RuleTest() {
         assertThat(p).matches("var is not null")
     }
 
+    @Test
+    fun matchesIsTrue() {
+        assertThat(p).matches("var is true")
+    }
+
+    @Test
+    fun matchesIsNotTrue() {
+        assertThat(p).matches("var is not true")
+    }
+
+    @Test
+    fun matchesIsFalse() {
+        assertThat(p).matches("var is false")
+    }
+
+    @Test
+    fun matchesIsNotFalse() {
+        assertThat(p).matches("var is not false")
+    }
+
     @Test
     fun matchesBasicIn() {
         assertThat(p).matches("var in (1)")