diff --git a/library/src/main/java/org/mustangproject/ClassCode.java b/library/src/main/java/org/mustangproject/ClassCode.java
index 75fd59e9..61fdd20f 100644
--- a/library/src/main/java/org/mustangproject/ClassCode.java
+++ b/library/src/main/java/org/mustangproject/ClassCode.java
@@ -31,8 +31,8 @@ import org.w3c.dom.Node;
 @JsonIgnoreProperties(ignoreUnknown = true)
 @JsonInclude(JsonInclude.Include.NON_EMPTY)
 public class ClassCode {
-	private final String listID;
-	private final String code;
+	private String listID;
+	private String code;
 	private String listVersionID;
 
 	/**
@@ -58,6 +58,13 @@ public class ClassCode {
 		this(listID, code, null);
 	}
 
+	/***
+	 * bean constructor
+	 */
+	public ClassCode() {
+	}
+
+
 	/***
 	 * Set the version for the scheme returned by {@link #getListID()}
 	 * @param listVersionID the scheme version
diff --git a/library/src/main/java/org/mustangproject/Product.java b/library/src/main/java/org/mustangproject/Product.java
index cc19932d..4bbde404 100644
--- a/library/src/main/java/org/mustangproject/Product.java
+++ b/library/src/main/java/org/mustangproject/Product.java
@@ -2,6 +2,7 @@ package org.mustangproject;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonSetter;
 import org.mustangproject.ZUGFeRD.IDesignatedProductClassification;
 import org.mustangproject.ZUGFeRD.IZUGFeRDExportableProduct;
 import org.mustangproject.util.NodeMap;
@@ -32,6 +33,7 @@ public class Product implements IZUGFeRDExportableProduct {
 	protected SchemedID globalId = null;
 	protected String countryOfOrigin = null;
 	protected HashMap<String, String> attributes = new HashMap<>();
+
 	protected List<IDesignatedProductClassification> classifications = new ArrayList<>();
 
 	/***
@@ -365,6 +367,23 @@ public class Product implements IZUGFeRDExportableProduct {
 		return this;
 	}
 
+
+	/**
+	 * Provide Jackson a hint as to use DesignatedProductClassification for the
+	 * IDesignatedProductClassification product classifications
+	 *
+	 * @param classifications the new set of classifications
+	 * @return fluent setter
+	 */
+	@JsonSetter("classifications")
+	public Product setClassificationsClass(DesignatedProductClassification[] classifications) {
+		this.classifications.clear();
+		if (classifications != null) {
+			this.classifications.addAll(Arrays.asList(classifications));
+		}
+		return this;
+	}
+
 	/**
 	 * Add a {@link IDesignatedProductClassification} classification
 	 *
diff --git a/library/src/test/java/org/mustangproject/ZUGFeRD/DeSerializationTest.java b/library/src/test/java/org/mustangproject/ZUGFeRD/DeSerializationTest.java
index a9c35c1b..f2d16980 100644
--- a/library/src/test/java/org/mustangproject/ZUGFeRD/DeSerializationTest.java
+++ b/library/src/test/java/org/mustangproject/ZUGFeRD/DeSerializationTest.java
@@ -21,6 +21,7 @@
  */
 package org.mustangproject.ZUGFeRD;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import junit.framework.TestCase;
@@ -165,6 +166,34 @@ public class DeSerializationTest extends ResourceCase {
 
 	}
 
+	public void testFull300Roundtrip() {
+		File inputCII = getResourceAsFile("not_validating_full_invoice_based_onTest_EeISI_300_CENfullmodel.cii.xml");
+
+		Invoice i=new Invoice();
+		String exText=null;
+		ZUGFeRDInvoiceImporter zii = new ZUGFeRDInvoiceImporter();
+		zii.doIgnoreCalculationErrors();
+		try {
+			zii.fromXML(new String(Files.readAllBytes(inputCII.toPath()), StandardCharsets.UTF_8));
+			ObjectMapper mapper = new ObjectMapper();
+			zii.extractInto(i);
+			String json = mapper.writeValueAsString(i);
+			Invoice newInvoiceFromJSON = mapper.readValue(json, Invoice.class);
+
+			assertEquals("Test_EeISI_100",i.getNumber());
+			assertEquals(newInvoiceFromJSON.getNumber(),i.getNumber());
+
+		} catch (IOException e) {
+			exText=e.getMessage();
+		} catch (XPathExpressionException e) {
+			exText=e.getMessage();
+		} catch (ParseException e) {
+			exText=e.getMessage();
+		}
+		assertNull(exText);
+
+
+	}
 
 	public void testIssuerAssignedIDRoundtrip() {
 		String occurrenceFrom = "20201001";