diff --git a/service/src/main/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendController.java b/service/src/main/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendController.java
index b2d27662d..49cd51600 100644
--- a/service/src/main/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendController.java
+++ b/service/src/main/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendController.java
@@ -30,7 +30,7 @@
 public class EhrResendController {
 
     private static final String OPERATION_OUTCOME_URL = "https://fhir.nhs.uk/STU3/StructureDefinition/GPConnect-OperationOutcome-1";
-    private static final String CONFLICT = "CONFLICT";
+    private static final String PRECONDITION_FAILED = "PRECONDITION_FAILED";
     private static final String INVALID_IDENTIFIER_VALUE = "INVALID_IDENTIFIER_VALUE";
 
     private EhrExtractStatusRepository ehrExtractStatusRepository;
@@ -58,7 +58,7 @@ public ResponseEntity<String> scheduleEhrExtractResend(@PathVariable String conv
 
         if (hasNoErrorsInEhrReceivedAcknowledgement(ehrExtractStatus) && ehrExtractStatus.getError() == null) {
 
-            var details = getCodeableConcept(CONFLICT);
+            var details = getCodeableConcept(PRECONDITION_FAILED);
             var diagnostics = "The current resend operation is still in progress. Please wait for it to complete before retrying";
             var operationOutcome = createOperationOutcome(OperationOutcome.IssueType.BUSINESSRULE,
                                                           OperationOutcome.IssueSeverity.ERROR,
@@ -78,7 +78,7 @@ public ResponseEntity<String> scheduleEhrExtractResend(@PathVariable String conv
 
     private static CodeableConcept getCodeableConcept(String codeableConceptCode) {
         return new CodeableConcept().addCoding(
-            new Coding("http://fhir.nhs.net/ValueSet/gpconnect-error-or-warning-code-1", codeableConceptCode, null));
+            new Coding("https://fhir.nhs.uk/STU3/ValueSet/Spine-ErrorOrWarningCode-1", codeableConceptCode, null));
     }
 
     private static boolean hasNoErrorsInEhrReceivedAcknowledgement(EhrExtractStatus ehrExtractStatus) {
diff --git a/service/src/test/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendControllerTest.java b/service/src/test/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendControllerTest.java
index a93b5f65b..d4cd3bd32 100644
--- a/service/src/test/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendControllerTest.java
+++ b/service/src/test/java/uk/nhs/adaptors/gp2gp/ehr/EhrResendControllerTest.java
@@ -46,8 +46,8 @@ class EhrResendControllerTest {
     private static final String FROM_ASID_CODE = "test-from-asid";
     private static final String INCUMBENT_NACK_CODE = "99";
     private static final String INCUMBENT_NACK_DISPLAY = "Unexpected condition.";
-    private static final String CONFLICT = "CONFLICT";
-    private static final String GPCONNECT_ERROR_OR_WARNING_CODE = "http://fhir.nhs.net/ValueSet/gpconnect-error-or-warning-code-1";
+    private static final String PRECONDITION_FAILED = "PRECONDITION_FAILED";
+    private static final String GPCONNECT_ERROR_OR_WARNING_CODE = "https://fhir.nhs.uk/STU3/ValueSet/Spine-ErrorOrWarningCode-1";
     private static final String INVALID_IDENTIFIER_VALUE = "INVALID_IDENTIFIER_VALUE";
     public static final String ISSUE_CODE_VALUE = "value";
     public static final String ISSUE_CODE_BUSINESS_RULE = "business-rule";
@@ -129,7 +129,7 @@ void When_AnEhrExtractHasFailed_Expect_GetGpcStructuredTaskScheduledAndEhrExtrac
     }
 
     @Test
-    void When_AnEhrExtractHasNotFailedAndAnotherResendRequestArrives_Expect_FailedOperationOutcome() throws JsonProcessingException {
+    void When_AnEhrExtractIsStillInProgress_Expect_FailedOperationOutcome() throws JsonProcessingException {
 
         final EhrExtractStatus IN_PROGRESS_EXTRACT_STATUS = EhrExtractStatus.builder()
             .conversationId(CONVERSATION_ID)
@@ -145,7 +145,7 @@ void When_AnEhrExtractHasNotFailedAndAnotherResendRequestArrives_Expect_FailedOp
         JsonNode rootNode = objectMapper.readTree(response.getBody());
 
         assertAll(
-            () -> assertResponseHasExpectedOperationOutcome(rootNode, CONFLICT, DIAGNOSTICS_MSG, ISSUE_CODE_BUSINESS_RULE),
+            () -> assertResponseHasExpectedOperationOutcome(rootNode, PRECONDITION_FAILED, DIAGNOSTICS_MSG, ISSUE_CODE_BUSINESS_RULE),
             () -> assertEquals(HttpStatus.CONFLICT, response.getStatusCode())
         );
     }
@@ -181,7 +181,7 @@ void When_AnEhrExtractHasFailed_Expect_RespondsWith202() {
     }
 
     @Test
-    void When_AnEhrExtractHasNotFailed_Expect_RespondsWith403() throws JsonProcessingException {
+    void When_AnEhrExtractHasAPositiveAcknowledgement_Expect_FailedOperationOutcome() throws JsonProcessingException {
 
         String ehrMessageRef = generateRandomUppercaseUUID();
         var ehrExtractStatus = new EhrExtractStatus();
@@ -202,7 +202,7 @@ void When_AnEhrExtractHasNotFailed_Expect_RespondsWith403() throws JsonProcessin
         JsonNode rootNode = objectMapper.readTree(response.getBody());
 
         assertAll(
-            () -> assertResponseHasExpectedOperationOutcome(rootNode, CONFLICT, DIAGNOSTICS_MSG, ISSUE_CODE_BUSINESS_RULE),
+            () -> assertResponseHasExpectedOperationOutcome(rootNode, PRECONDITION_FAILED, DIAGNOSTICS_MSG, ISSUE_CODE_BUSINESS_RULE),
             () -> assertEquals(HttpStatus.CONFLICT, response.getStatusCode())
         );
     }