diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index e3752f3d6..c749f16f4 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,22 +1,25 @@
-Validator:
-
-* Add support for $index on aggregators in FHIRPath
-* don't fail with an exception if an unknown resource type appears in contained resource
-* improved validation for some value sets that are based on unknown code systems
-* add the -verbose parameter, and add additional verbose messages
-* CDA: Fix erroneous type validation on CDA templates
-
-Snapshot generator:
-* CDA: Suppress erroneous "Expansion" text appearing in view
-* CDA: Don't delete binding information in snapshot for CDA bindable data types
-
-Other code changes:
-
-* Fix rendering of slices so type on slicer is not hidden
-* Fix rendering for most resources - remove empty tables (e.g. text element, that shouldn't render)
-* Fix NPE rendering code systems with some kinds of properties
-* Improve rendering of questionnaires (icons, option sets)
-* Rendering: add support for CodeableReference
-* Rendering: Support binding mode and XML element information 
-
-
+Validator:
+
+* Add support for $index on aggregators in FHIRPath
+* don't fail with an exception if an unknown resource type appears in contained resource
+* improved validation for some value sets that are based on unknown code systems
+* add the -verbose parameter, and add additional verbose messages
+* CDA: Fix erroneous type validation on CDA templates
+
+Conversion code:
+
+* Ignoring abatementBoolean when converting from dstu2 to r4
+
+Snapshot generator:
+
+* CDA: Suppress erroneous "Expansion" text appearing in view
+* CDA: Don't delete binding information in snapshot for CDA bindable data types
+
+Other code changes:
+
+* Fix rendering of slices so type on slicer is not hidden
+* Fix rendering for most resources - remove empty tables (e.g. text element, that shouldn't render)
+* Fix NPE rendering code systems with some kinds of properties
+* Improve rendering of questionnaires (icons, option sets)
+* Rendering: add support for CodeableReference
+* Rendering: Support binding mode and XML element information 
diff --git a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv10_40/Condition10_40.java b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv10_40/Condition10_40.java
index 46edcd7fe..07eee6434 100644
--- a/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv10_40/Condition10_40.java
+++ b/org.hl7.fhir.convertors/src/main/java/org/hl7/fhir/convertors/conv10_40/Condition10_40.java
@@ -30,7 +30,7 @@ public class Condition10_40 {
             tgt.setSeverity(VersionConvertor_10_40.convertCodeableConcept(src.getSeverity()));
         if (src.hasOnset())
             tgt.setOnset(VersionConvertor_10_40.convertType(src.getOnset()));
-        if (src.hasAbatement())
+        if (src.hasAbatement() && !(src.getAbatement() instanceof org.hl7.fhir.r4.model.BooleanType))
             tgt.setAbatement(VersionConvertor_10_40.convertType(src.getAbatement()));
         if (src.hasStage())
             tgt.setStage(convertConditionStageComponent(src.getStageFirstRep()));