diff --git a/resources/zib/zib-SOAPReport-Observation.xml b/resources/zib/zib-SOAPReport-Observation.xml
index 51df1bd07..c3913ed85 100644
--- a/resources/zib/zib-SOAPReport-Observation.xml
+++ b/resources/zib/zib-SOAPReport-Observation.xml
@@ -38,7 +38,7 @@
         <key value="zib-SOAPReport-Observation" />
         <severity value="error" />
         <human value="In a SOAP report an ICPC code may be assigned, but only to the S and E line." />
-        <expression value="extension('http://nictiz.nl/fhir/StructureDefinition/ext-SOAPReport.SOAPLineCode').exists() implies (code.coding.where(value = '255362007' and system = 'http://snomed.info/sct').exists() or code.coding.where(value = '129265001' and system = 'http://snomed.info/sct').exists())" />
+        <expression value="extension('http://nictiz.nl/fhir/StructureDefinition/ext-SOAPReport.SOAPLineCode').exists() implies (code.coding.where(code = '255362007' and system = 'http://snomed.info/sct').exists() or code.coding.where(code = '129265001' and system = 'http://snomed.info/sct').exists())" />
         <source value="http://nictiz.nl/fhir/StructureDefinition/zib-SOAPReport-Observation" />
       </constraint>
       <mapping>