diff --git a/specs/composition/common/schemas/components/CompositionBehavior.yml b/specs/composition/common/schemas/components/CompositionBehavior.yml
index f41bea4bc76..10a8ca2f3df 100644
--- a/specs/composition/common/schemas/components/CompositionBehavior.yml
+++ b/specs/composition/common/schemas/components/CompositionBehavior.yml
@@ -41,6 +41,16 @@ compositionBehavior:
           maxItems: 2
           items:
             $ref: '#/injectedItem'
+        deduplication:
+          title: deduplication
+          type: object
+          additionalProperties: false
+          description: Deduplication configures the methods used to resolve duplicate items between main search results and injected group results.
+          properties:
+            positioning:
+              $ref: '#/dedupPositioning'
+          required:
+            - positioning
       required:
         - main
   required:
@@ -91,3 +101,17 @@ injectedItemSource:
   oneOf:
     - $ref: './InjectionSource.yml#/SearchSource'
     - $ref: './InjectionSource.yml#/ExternalSource'
+
+dedupPositioning:
+  type: string
+  enum:
+    - highest
+    - highestInjected
+  description: |
+    Deduplication positioning configures how a duplicate result should be resolved between an injected item and main search results.
+    Current configuration supports:
+    - 'highest': always select the item in the highest position, and remove duplicates that appear lower in the results.
+    - 'highestInjected': duplicate result will be moved to its highest possible injected position, but not higher. 
+      If a duplicate appears higher in main search results, it will be removed to stay it's intended group position (which could be lower than main).
+  example: highest
+  default: highestInjected
diff --git a/tests/CTS/requests/composition/multipleBatch.json b/tests/CTS/requests/composition/multipleBatch.json
index 5fabb5d94a1..1f620e46fab 100644
--- a/tests/CTS/requests/composition/multipleBatch.json
+++ b/tests/CTS/requests/composition/multipleBatch.json
@@ -62,9 +62,7 @@
     }
   },
   {
-    "skipLanguages": [
-      "kotlin"
-    ],
+    "skipLanguages": ["kotlin"],
     "parameters": {
       "requests": [
         {
@@ -147,9 +145,7 @@
     }
   },
   {
-    "skipLanguages": [
-      "kotlin"
-    ],
+    "skipLanguages": ["kotlin"],
     "parameters": {
       "requests": [
         {
@@ -312,5 +308,86 @@
         ]
       }
     }
+  },
+  {
+    "skipLanguages": ["kotlin"],
+    "parameters": {
+      "requests": [
+        {
+          "action": "upsert",
+          "body": {
+            "objectID": "my-compo",
+            "name": "my composition",
+            "behavior": {
+              "injection": {
+                "main": {
+                  "source": {
+                    "search": {
+                      "index": "foo"
+                    }
+                  }
+                },
+                "injectedItems": [
+                  {
+                    "key": "my-unique-injected-item-key",
+                    "source": {
+                      "search": {
+                        "index": "foo"
+                      }
+                    },
+                    "position": 2,
+                    "length": 1
+                  }
+                ],
+                "deduplication": {
+                  "positioning": "highest"
+                }
+              }
+            }
+          }
+        }
+      ]
+    },
+    "request": {
+      "path": "/1/compositions/*/batch",
+      "method": "POST",
+      "body": {
+        "requests": [
+          {
+            "action": "upsert",
+            "body": {
+              "objectID": "my-compo",
+              "name": "my composition",
+              "behavior": {
+                "injection": {
+                  "main": {
+                    "source": {
+                      "search": {
+                        "index": "foo"
+                      }
+                    }
+                  },
+                  "injectedItems": [
+                    {
+                      "key": "my-unique-injected-item-key",
+                      "source": {
+                        "search": {
+                          "index": "foo"
+                        }
+                      },
+                      "position": 2,
+                      "length": 1
+                    }
+                  ],
+                  "deduplication": {
+                    "positioning": "highest"
+                  }
+                }
+              }
+            }
+          }
+        ]
+      }
+    }
   }
 ]
diff --git a/tests/CTS/requests/composition/putComposition.json b/tests/CTS/requests/composition/putComposition.json
index f2fb892eb29..e95672ab842 100644
--- a/tests/CTS/requests/composition/putComposition.json
+++ b/tests/CTS/requests/composition/putComposition.json
@@ -134,9 +134,7 @@
     }
   },
   {
-    "skipLanguages": [
-      "kotlin"
-    ],
+    "skipLanguages": ["kotlin"],
     "parameters": {
       "compositionID": "my-metadata-compo",
       "composition": {
@@ -288,5 +286,80 @@
         }
       }
     }
+  },
+  {
+    "parameters": {
+      "compositionID": "my-compo",
+      "composition": {
+        "objectID": "my-compo",
+        "name": "my composition",
+        "behavior": {
+          "injection": {
+            "main": {
+              "source": {
+                "search": {
+                  "index": "foo",
+                  "params": {
+                    "filters": "brand:adidas"
+                  }
+                }
+              }
+            },
+            "injectedItems": [
+              {
+                "key": "my-unique-injected-item-key",
+                "source": {
+                  "search": {
+                    "index": "foo"
+                  }
+                },
+                "position": 2,
+                "length": 1
+              }
+            ],
+            "deduplication": {
+              "positioning": "highest"
+            }
+          }
+        }
+      }
+    },
+    "request": {
+      "path": "/1/compositions/my-compo",
+      "method": "PUT",
+      "body": {
+        "objectID": "my-compo",
+        "name": "my composition",
+        "behavior": {
+          "injection": {
+            "main": {
+              "source": {
+                "search": {
+                  "index": "foo",
+                  "params": {
+                    "filters": "brand:adidas"
+                  }
+                }
+              }
+            },
+            "injectedItems": [
+              {
+                "key": "my-unique-injected-item-key",
+                "source": {
+                  "search": {
+                    "index": "foo"
+                  }
+                },
+                "position": 2,
+                "length": 1
+              }
+            ],
+            "deduplication": {
+              "positioning": "highest"
+            }
+          }
+        }
+      }
+    }
   }
 ]
diff --git a/tests/CTS/requests/composition/putCompositionRule.json b/tests/CTS/requests/composition/putCompositionRule.json
index b27b2478f0c..42c96f71900 100644
--- a/tests/CTS/requests/composition/putCompositionRule.json
+++ b/tests/CTS/requests/composition/putCompositionRule.json
@@ -78,9 +78,7 @@
     }
   },
   {
-    "skipLanguages": [
-      "kotlin"
-    ],
+    "skipLanguages": ["kotlin"],
     "parameters": {
       "compositionID": "compositionID",
       "objectID": "rule-with-metadata",
@@ -197,10 +195,7 @@
       "compositionRule": {
         "objectID": "rule-with-exernal-source",
         "description": "my description",
-        "tags": [
-          "tag1",
-          "tag2"
-        ],
+        "tags": ["tag1", "tag2"],
         "enabled": true,
         "validity": [
           {
@@ -258,10 +253,7 @@
       "body": {
         "objectID": "rule-with-exernal-source",
         "description": "my description",
-        "tags": [
-          "tag1",
-          "tag2"
-        ],
+        "tags": ["tag1", "tag2"],
         "enabled": true,
         "validity": [
           {
@@ -313,5 +305,93 @@
         }
       }
     }
+  },
+  {
+    "parameters": {
+      "compositionID": "compositionID",
+      "objectID": "rule-with-deduplication",
+      "compositionRule": {
+        "objectID": "rule-with-deduplication",
+        "description": "my description",
+        "enabled": true,
+        "conditions": [
+          {
+            "anchoring": "contains",
+            "pattern": "harry"
+          }
+        ],
+        "consequence": {
+          "behavior": {
+            "injection": {
+              "main": {
+                "source": {
+                  "search": {
+                    "index": "my-index"
+                  }
+                }
+              },
+              "injectedItems": [
+                {
+                  "key": "my-unique-injected-item-key",
+                  "source": {
+                    "search": {
+                      "index": "my-index"
+                    }
+                  },
+                  "position": 0,
+                  "length": 3
+                }
+              ],
+              "deduplication": {
+                "positioning": "highestInjected"
+              }
+            }
+          }
+        }
+      }
+    },
+    "request": {
+      "path": "/1/compositions/compositionID/rules/rule-with-deduplication",
+      "method": "PUT",
+      "body": {
+        "objectID": "rule-with-deduplication",
+        "description": "my description",
+        "enabled": true,
+        "conditions": [
+          {
+            "anchoring": "contains",
+            "pattern": "harry"
+          }
+        ],
+        "consequence": {
+          "behavior": {
+            "injection": {
+              "main": {
+                "source": {
+                  "search": {
+                    "index": "my-index"
+                  }
+                }
+              },
+              "injectedItems": [
+                {
+                  "key": "my-unique-injected-item-key",
+                  "source": {
+                    "search": {
+                      "index": "my-index"
+                    }
+                  },
+                  "position": 0,
+                  "length": 3
+                }
+              ],
+              "deduplication": {
+                "positioning": "highestInjected"
+              }
+            }
+          }
+        }
+      }
+    }
   }
 ]
diff --git a/tests/CTS/requests/composition/saveRules.json b/tests/CTS/requests/composition/saveRules.json
index 03069a1db1f..c525a5dcb04 100644
--- a/tests/CTS/requests/composition/saveRules.json
+++ b/tests/CTS/requests/composition/saveRules.json
@@ -65,9 +65,7 @@
     }
   },
   {
-    "skipLanguages": [
-      "kotlin"
-    ],
+    "skipLanguages": ["kotlin"],
     "parameters": {
       "compositionID": "rule-with-metadata",
       "rules": {
@@ -200,10 +198,7 @@
             "body": {
               "objectID": "rule-with-exernal-source",
               "description": "my description",
-              "tags": [
-                "tag1",
-                "tag2"
-              ],
+              "tags": ["tag1", "tag2"],
               "enabled": true,
               "validity": [
                 {
@@ -268,10 +263,7 @@
             "body": {
               "objectID": "rule-with-exernal-source",
               "description": "my description",
-              "tags": [
-                "tag1",
-                "tag2"
-              ],
+              "tags": ["tag1", "tag2"],
               "enabled": true,
               "validity": [
                 {
@@ -326,5 +318,106 @@
         ]
       }
     }
+  },
+  {
+    "parameters": {
+      "compositionID": "my-compo",
+      "rules": {
+        "requests": [
+          {
+            "action": "upsert",
+            "body": {
+              "objectID": "rule-with-deduplication",
+              "description": "my description",
+              "enabled": true,
+              "conditions": [
+                {
+                  "anchoring": "contains",
+                  "pattern": "harry"
+                }
+              ],
+              "consequence": {
+                "behavior": {
+                  "injection": {
+                    "main": {
+                      "source": {
+                        "search": {
+                          "index": "my-index"
+                        }
+                      }
+                    },
+                    "injectedItems": [
+                      {
+                        "key": "my-unique-injected-item-key",
+                        "source": {
+                          "search": {
+                            "index": "my-index"
+                          }
+                        },
+                        "position": 0,
+                        "length": 3
+                      }
+                    ],
+                    "deduplication": {
+                      "positioning": "highestInjected"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        ]
+      }
+    },
+    "request": {
+      "path": "/1/compositions/my-compo/rules/batch",
+      "method": "POST",
+      "body": {
+        "requests": [
+          {
+            "action": "upsert",
+            "body": {
+              "objectID": "rule-with-deduplication",
+              "description": "my description",
+              "enabled": true,
+              "conditions": [
+                {
+                  "anchoring": "contains",
+                  "pattern": "harry"
+                }
+              ],
+              "consequence": {
+                "behavior": {
+                  "injection": {
+                    "main": {
+                      "source": {
+                        "search": {
+                          "index": "my-index"
+                        }
+                      }
+                    },
+                    "injectedItems": [
+                      {
+                        "key": "my-unique-injected-item-key",
+                        "source": {
+                          "search": {
+                            "index": "my-index"
+                          }
+                        },
+                        "position": 0,
+                        "length": 3
+                      }
+                    ],
+                    "deduplication": {
+                      "positioning": "highestInjected"
+                    }
+                  }
+                }
+              }
+            }
+          }
+        ]
+      }
+    }
   }
 ]