diff --git a/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateChangelogApi.kt b/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateChangelogApi.kt
index 7b553819f..5b3bcddbe 100644
--- a/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateChangelogApi.kt
+++ b/bpdm-gate-api/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/api/GateChangelogApi.kt
@@ -58,7 +58,7 @@ interface GateChangelogApi {
     fun getChangelogEntriesExternalId(
         @ParameterObject @Valid paginationRequest: PaginationRequest,
         @Parameter(description = "From Time", example = "2023-03-20T10:23:28.194Z") @RequestParam(required = false) fromTime: Instant?,
-        @RequestBody(required = true)  @NotEmpty(message = "Input externalIds list cannot be empty.") externalIds: Collection<String>
+        @RequestBody(required = true) @NotEmpty(message = "Input externalIds list cannot be empty.") externalIds: Set<String>
     ): PageChangeLogResponse<ChangelogResponse>
 
     @Operation(
diff --git a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangelogController.kt b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangelogController.kt
index deb2391d8..5658836f8 100644
--- a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangelogController.kt
+++ b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangelogController.kt
@@ -37,7 +37,7 @@ class ChangelogController(
 ) : GateChangelogApi {
 
     override fun getChangelogEntriesExternalId(
-        paginationRequest: PaginationRequest, fromTime: Instant?, externalIds: Collection<String>
+        paginationRequest: PaginationRequest, fromTime: Instant?, externalIds: Set<String>
     ): PageChangeLogResponse<ChangelogResponse> {
         return changelogService.getChangeLogByExternalId(externalIds, fromTime, paginationRequest.page, paginationRequest.size)
     }
diff --git a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/repository/ChangelogRepository.kt b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/repository/ChangelogRepository.kt
index aade6279e..9f2a39964 100644
--- a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/repository/ChangelogRepository.kt
+++ b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/repository/ChangelogRepository.kt
@@ -19,11 +19,13 @@
 
 package org.eclipse.tractusx.bpdm.gate.repository
 
+import io.swagger.v3.oas.annotations.Parameter
 import org.eclipse.tractusx.bpdm.gate.api.model.response.LsaType
 import org.eclipse.tractusx.bpdm.gate.entity.ChangelogEntity
 import org.springframework.data.jpa.domain.Specification
 import org.springframework.data.jpa.repository.JpaRepository
 import org.springframework.data.jpa.repository.JpaSpecificationExecutor
+import org.springframework.data.jpa.repository.Query
 import java.time.Instant
 
 
@@ -64,5 +66,8 @@ interface ChangelogRepository : JpaRepository<ChangelogEntity, Long>, JpaSpecifi
             }
     }
 
+    @Query("select distinct u.externalId from ChangelogEntity u where u.externalId in :externalIdList")
+    fun findExternalIdsInListDistinct(externalIdList: Collection<String>): Set<String>
+
 
 }
diff --git a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/ChangelogService.kt b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/ChangelogService.kt
index 7eac1845d..fbf954423 100644
--- a/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/ChangelogService.kt
+++ b/bpdm-gate/src/main/kotlin/org/eclipse/tractusx/bpdm/gate/service/ChangelogService.kt
@@ -29,42 +29,45 @@ import org.eclipse.tractusx.bpdm.gate.repository.ChangelogRepository
 import org.eclipse.tractusx.bpdm.gate.repository.ChangelogRepository.Specs.byCreatedAtGreaterThan
 import org.eclipse.tractusx.bpdm.gate.repository.ChangelogRepository.Specs.byExternalIdsIn
 import org.eclipse.tractusx.bpdm.gate.repository.ChangelogRepository.Specs.byLsaType
+import org.springframework.data.domain.PageImpl
 import org.springframework.data.domain.PageRequest
 import org.springframework.data.jpa.domain.Specification
 import org.springframework.stereotype.Service
+
 import java.time.Instant
+import kotlin.math.ceil
 
 @Service
 class ChangelogService(private val changelogRepository: ChangelogRepository) {
 
-    fun getChangeLogByExternalId(externalIds: Collection<String>, createdAt: Instant?, page: Int, pageSize: Int): PageChangeLogResponse<ChangelogResponse> {
+    fun getChangeLogByExternalId(externalIds: Set<String>, createdAt: Instant?, page: Int, pageSize: Int): PageChangeLogResponse<ChangelogResponse> {
 
         val spec = Specification.allOf(byExternalIdsIn(externalIds = externalIds), byCreatedAtGreaterThan(createdAt = createdAt))
         val pageable = PageRequest.of(page, pageSize)
         val pageResponse = changelogRepository.findAll(spec, pageable)
+        val setDistinctList = changelogRepository.findExternalIdsInListDistinct(externalIds)
 
 
         val pageDto = pageResponse.map {
             it.toGateDto()
         }
 
-        val errorInfoSet = externalIds.filterNot { id ->
-            pageDto.content.any { it.externalId == id }
-        }.map {
+        val errorList = (externalIds - setDistinctList).map {
             ErrorInfo(
                 ChangeLogOutputError.ExternalIdNotFound,
                 "$it not found",
                 it
             )
-        }.toSet()
+        }
+
 
         return PageChangeLogResponse(
             page = page, totalElements = pageDto.totalElements,
             totalPages = pageDto.totalPages,
             contentSize = pageDto.content.size,
             content = pageDto.content,
-            invalidEntries = errorInfoSet.size,
-            errors = errorInfoSet
+            invalidEntries = errorList.size,
+            errors = errorList
         )
     }
 
@@ -86,4 +89,5 @@ class ChangelogService(private val changelogRepository: ChangelogRepository) {
             content = pageDto.content,
         )
     }
+
 }
\ No newline at end of file
diff --git a/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangeLogControllerIT.kt b/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangeLogControllerIT.kt
index bcbd4a915..c394214c2 100644
--- a/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangeLogControllerIT.kt
+++ b/bpdm-gate/src/test/kotlin/org/eclipse/tractusx/bpdm/gate/controller/ChangeLogControllerIT.kt
@@ -116,7 +116,7 @@ internal class ChangeLogControllerIT @Autowired constructor(
     @Test
     fun `get changeLog by external id`() {
 
-        val searchResult = gateClient.changelog().getChangelogEntriesExternalId(PaginationRequest(), null, listOf(CommonValues.externalIdAddress1))
+        val searchResult = gateClient.changelog().getChangelogEntriesExternalId(PaginationRequest(), null, setOf(CommonValues.externalIdAddress1))
 
         assertRecursively(searchResult.content)
             .ignoringFieldsMatchingRegexes(".*${ChangelogResponse::modifiedAt.name}")
@@ -133,7 +133,7 @@ internal class ChangeLogControllerIT @Autowired constructor(
     @Test
     fun `get changeLog by external id not found`() {
 
-        val searchResult = gateClient.changelog().getChangelogEntriesExternalId(PaginationRequest(), null, listOf("NONEXIST"))
+        val searchResult = gateClient.changelog().getChangelogEntriesExternalId(PaginationRequest(), null, setOf("NONEXIST"))
 
         assertThat(searchResult.content)
             .usingRecursiveComparison()
@@ -164,7 +164,7 @@ internal class ChangeLogControllerIT @Autowired constructor(
     @Test
     fun `get changeLog by external id and timeStamp`() {
 
-        val searchResult = gateClient.changelog().getChangelogEntriesExternalId(PaginationRequest(), instant, listOf(CommonValues.externalIdAddress1))
+        val searchResult = gateClient.changelog().getChangelogEntriesExternalId(PaginationRequest(), instant, setOf(CommonValues.externalIdAddress1))
 
 
         assertRecursively(searchResult.content).ignoringFieldsMatchingRegexes(".*${ChangelogResponse::modifiedAt.name}")