diff --git a/pom.xml b/pom.xml
index a855a61e..412fd764 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,7 +30,7 @@
         <referencedata.offences.version>17.0.38</referencedata.offences.version>
         <system.enterprise-id.version>0.0.3</system.enterprise-id.version>
         <resulting.version>17.0.42</resulting.version>
-        <progression.version>17.0.262</progression.version>
+        <progression.version>17.0.279</progression.version>
         <defence.version>17.0.87</defence.version>
         <criminal-court-public-model.version>${coredomain.version}</criminal-court-public-model.version>
         <notification.notify.version>17.0.24</notification.notify.version>
diff --git a/prosecutioncasefile-domain/prosecutioncasefile-domain-event-processor/pom.xml b/prosecutioncasefile-domain/prosecutioncasefile-domain-event-processor/pom.xml
index b3929ba6..2e5c5193 100644
--- a/prosecutioncasefile-domain/prosecutioncasefile-domain-event-processor/pom.xml
+++ b/prosecutioncasefile-domain/prosecutioncasefile-domain-event-processor/pom.xml
@@ -245,6 +245,17 @@
                             </exclusion>
                         </exclusions>
                     </dependency>
+                    <dependency>
+                        <groupId>uk.gov.moj.cpp.progression</groupId>
+                        <artifactId>progression-datatypes-common</artifactId>
+                        <version>${progression.version}</version>
+                        <exclusions>
+                            <exclusion>
+                                <groupId>*</groupId>
+                                <artifactId>*</artifactId>
+                            </exclusion>
+                        </exclusions>
+                    </dependency>
                     <dependency>
                         <groupId>uk.gov.moj.cpp.core.domain</groupId>
                         <artifactId>criminal-court-public-model</artifactId>
diff --git a/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/main/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverter.java b/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/main/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverter.java
index 6d4d8fb5..27a65362 100644
--- a/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/main/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverter.java
+++ b/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/main/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverter.java
@@ -69,7 +69,7 @@ public List<uk.gov.justice.core.courts.Defendant> convert(final List<uk.gov.moj.
                                     .withProsecutionAuthorityReference(defendant.getProsecutorDefendantReference())
                                     .withProsecutionCaseId(paramsVO.getCaseId())
                                     .withLegalEntityDefendant(prosecutionCaseFileToCCLegalEntityDefendantConverter.convert(defendant))
-                                    .withNumberOfPreviousConvictionsCited(defendant.getNumPreviousConvictions())
+                                    .withNumberOfPreviousConvictionsCited(nonNegativeOrNull(defendant.getNumPreviousConvictions()))
                                     .withAssociatedPersons(defendant.getIndividual() != null ? buildAssociatedPersons(defendant.getIndividual().getParentGuardianInformation(), paramsVO.getReferenceDataVO()) : null);
 
                             if (isNotEmpty(defendant.getIndividualAliases())) {
@@ -195,6 +195,10 @@ private Optional<Gender> getGender(final uk.gov.moj.cpp.prosecution.casefile.jso
         }
     }
 
+    private static Integer nonNegativeOrNull(final Integer value) {
+        return value == null || value < 0 ? null : value;
+    }
+
     private Address buildAddress(final ParentGuardianInformation parentGuardianInformation) {
         if (null != parentGuardianInformation.getPersonalInformation() && null != parentGuardianInformation.getPersonalInformation().getAddress()) {
 
diff --git a/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/test/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverterTest.java b/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/test/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverterTest.java
index 7f4969b0..17a4ccfc 100644
--- a/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/test/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverterTest.java
+++ b/prosecutioncasefile-event/prosecutioncasefile-event-processor/src/test/java/uk/gov/moj/cpp/prosecution/casefile/event/processor/converter/ProsecutionCaseFileDefendantToCCDefendantConverterTest.java
@@ -105,4 +105,61 @@ private void assertAliasMiddleNameValues(final List<uk.gov.justice.core.courts.D
         assertThat(courtsDefendants.get(0).getAliases().get(2).getMiddleName(), is(GIVEN_NAME_3));
         assertThat(courtsDefendants.get(0).getAliases().get(3).getMiddleName(), is(nullValue()));
     }
+
+    @Test
+    public void convertNegativeNumPreviousConvictionsShouldBeDropped() {
+        final ProsecutionWithReferenceData prosecutionWithReferenceData = buildProsecutionWithReferenceData(EITHER_WAY);
+        final List<Defendant> defendants = prosecutionWithReferenceData.getProsecution().getDefendants();
+        defendants.forEach(d -> ReflectionUtil.setField(d, "numPreviousConvictions", -1));
+
+        final ParamsVO paramsVO = new ParamsVO();
+        paramsVO.setCaseId(prosecutionWithReferenceData.getProsecution().getCaseDetails().getCaseId());
+        paramsVO.setReferenceDataVO(prosecutionWithReferenceData.getReferenceDataVO());
+        paramsVO.setInitiationCode("J");
+
+        when(referenceDataQueryService.retrieveAlcoholLevelMethods()).thenReturn(asList(alcoholLevelMethodReferenceData().withMethodCode("A").withMethodDescription("Blood").build(),
+                alcoholLevelMethodReferenceData().withMethodCode("B").withMethodDescription("Breath").build()));
+
+        final List<uk.gov.justice.core.courts.Defendant> courtsDefendants = converter.convert(defendants, paramsVO);
+
+        assertThat(courtsDefendants.get(0).getNumberOfPreviousConvictionsCited(), is(nullValue()));
+    }
+
+    @Test
+    public void convertNonNegativeNumPreviousConvictionsShouldBePreserved() {
+        final ProsecutionWithReferenceData prosecutionWithReferenceData = buildProsecutionWithReferenceData(EITHER_WAY);
+        final List<Defendant> defendants = prosecutionWithReferenceData.getProsecution().getDefendants();
+        defendants.forEach(d -> ReflectionUtil.setField(d, "numPreviousConvictions", 0));
+
+        final ParamsVO paramsVO = new ParamsVO();
+        paramsVO.setCaseId(prosecutionWithReferenceData.getProsecution().getCaseDetails().getCaseId());
+        paramsVO.setReferenceDataVO(prosecutionWithReferenceData.getReferenceDataVO());
+        paramsVO.setInitiationCode("J");
+
+        when(referenceDataQueryService.retrieveAlcoholLevelMethods()).thenReturn(asList(alcoholLevelMethodReferenceData().withMethodCode("A").withMethodDescription("Blood").build(),
+                alcoholLevelMethodReferenceData().withMethodCode("B").withMethodDescription("Breath").build()));
+
+        final List<uk.gov.justice.core.courts.Defendant> courtsDefendants = converter.convert(defendants, paramsVO);
+
+        assertThat(courtsDefendants.get(0).getNumberOfPreviousConvictionsCited(), is(0));
+    }
+
+    @Test
+    public void convertNullNumPreviousConvictionsShouldRemainNull() {
+        final ProsecutionWithReferenceData prosecutionWithReferenceData = buildProsecutionWithReferenceData(EITHER_WAY);
+        final List<Defendant> defendants = prosecutionWithReferenceData.getProsecution().getDefendants();
+        defendants.forEach(d -> ReflectionUtil.setField(d, "numPreviousConvictions", null));
+
+        final ParamsVO paramsVO = new ParamsVO();
+        paramsVO.setCaseId(prosecutionWithReferenceData.getProsecution().getCaseDetails().getCaseId());
+        paramsVO.setReferenceDataVO(prosecutionWithReferenceData.getReferenceDataVO());
+        paramsVO.setInitiationCode("J");
+
+        when(referenceDataQueryService.retrieveAlcoholLevelMethods()).thenReturn(asList(alcoholLevelMethodReferenceData().withMethodCode("A").withMethodDescription("Blood").build(),
+                alcoholLevelMethodReferenceData().withMethodCode("B").withMethodDescription("Breath").build()));
+
+        final List<uk.gov.justice.core.courts.Defendant> courtsDefendants = converter.convert(defendants, paramsVO);
+
+        assertThat(courtsDefendants.get(0).getNumberOfPreviousConvictionsCited(), is(nullValue()));
+    }
 }
\ No newline at end of file