diff --git a/History.md b/History.md
index a940a217..97088002 100644
--- a/History.md
+++ b/History.md
@@ -1,10 +1,14 @@
 2.0.3
 =======
+2020-12-06
 
 - #201 correct embedded files in XRechnung
 - transaction calculator getGrandTotal now public
 - corrected sample in docs thanks to tweimer PR #204
 - don't write "null" as paymentDescription if no Bank account is specified
+- generic and unitcode/categorycode improvements (thanks to weclapp-dev) PR #207
+- programmatically switch to XRechnung 2.0 if invoked next year
+- support Credit Notes (additionally to corrected invoices)
 
 2.0.2
 =======
diff --git a/Mustang-CLI/pom.xml b/Mustang-CLI/pom.xml
index c4fd177a..274d1f1c 100644
--- a/Mustang-CLI/pom.xml
+++ b/Mustang-CLI/pom.xml
@@ -3,14 +3,14 @@
 <parent>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.0.3-SNAPSHOT</version>
+    <version>2.0.4-SNAPSHOT</version>
 </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.mustangproject</groupId>
    <artifactId>Mustang-CLI</artifactId>
    <name>Mustang commandline tool</name>
    <packaging>jar</packaging>
-   <version>2.0.3-SNAPSHOT</version>
+   <version>2.0.4-SNAPSHOT</version>
    <repositories>
       <repository>
          <!-- for jargs -->
@@ -31,7 +31,7 @@
       <dependency>
          <groupId>org.mustangproject</groupId>
          <artifactId>validator</artifactId>
-         <version>2.0.3-SNAPSHOT</version>
+         <version>2.0.4-SNAPSHOT</version>
          <!-- prototypes of new mustangproject versions can be installed by referring to them and installed to the local repo from a jar file with
         mvn install:install-file -Dfile=mustang-1.5.4-SNAPSHOT.jar -DgroupId=org.mustangproject.ZUGFeRD -DartifactId=mustang -Dversion=1.5.4 -Dpackaging=jar -DgeneratePom=true
         -->
diff --git a/doc/konikmustangvergleich.odt b/doc/konikmustangvergleich.odt
deleted file mode 100644
index 99c02ed5..00000000
Binary files a/doc/konikmustangvergleich.odt and /dev/null differ
diff --git a/library/pom.xml b/library/pom.xml
index fe73205a..d1c0b4bf 100644
--- a/library/pom.xml
+++ b/library/pom.xml
@@ -3,13 +3,13 @@
 <parent>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.0.3-SNAPSHOT</version>
+    <version>2.0.4-SNAPSHOT</version>
 </parent>
 
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.mustangproject</groupId>
 	<artifactId>library</artifactId>
-	<version>2.0.3-SNAPSHOT</version>
+	<version>2.0.4-SNAPSHOT</version>
 	<packaging>jar</packaging>
 	<name>Library to write and read FacturX and ZUGFeRD e-invoices.  </name>
 	<description>The Mustang project is a java library to read and write ZUGFeRD meta data inside your invoice PDFs. To write files, a provided PDF/A will be combined with generated or provided XML.
diff --git a/library/src/main/java/org/mustangproject/Invoice.java b/library/src/main/java/org/mustangproject/Invoice.java
index 1d0c121f..7562f41a 100644
--- a/library/src/main/java/org/mustangproject/Invoice.java
+++ b/library/src/main/java/org/mustangproject/Invoice.java
@@ -119,6 +119,10 @@ public class Invoice implements IExportableTransaction {
 		documentCode = DocumentCodeTypeConstants.CORRECTEDINVOICE;
 		return this;
 	}
+	public Invoice setCreditNote() {
+		documentCode = DocumentCodeTypeConstants.CREDITNOTE;
+		return this;
+	}
 
 	@Override
 	public String getOwnOrganisationFullPlaintextInfo() {
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/Profiles.java b/library/src/main/java/org/mustangproject/ZUGFeRD/Profiles.java
index 2496e801..515e9505 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/Profiles.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/Profiles.java
@@ -20,6 +20,7 @@
  */
 package org.mustangproject.ZUGFeRD;
 
+import java.time.Year;
 import java.util.Map;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -31,7 +32,7 @@ public class Profiles {
 			{"BASIC", new Profile("BASIC", "urn:cen.eu:en16931:2017#compliant#urn:factur-x.eu:1p0:basic")},
 			{"EN16931", new Profile("EN16931", "urn:cen.eu:en16931:2017")},
 			{"EXTENDED", new Profile("EXTENDED", "urn:cen.eu:en16931:2017#conformant#urn:factur-x.eu:1p0:extended")},
-			{"XRECHNUNG", new Profile("XRECHNUNG", "urn:cen.eu:en16931:2017#compliant#urn:xoev-de:kosit:standard:xrechnung_2.0")} 
+			{"XRECHNUNG", new Profile("XRECHNUNG", "urn:cen.eu:en16931:2017#compliant#urn:xoev-de:kosit:standard:xrechnung_"+((Year.now().getValue()<=2020)?"1.2":"2.0"))} //intentionally switch to XRechnung 2.0 on 01.01.2021
 
 	}).collect(Collectors.toMap(data -> (String) data[0], data -> (Profile) data[1]));
 	static Map<String, Profile> zf1Map = Stream.of(new Object[][]{
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
index 3129943e..5980cbf9 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/ZUGFeRD2PullProvider.java
@@ -40,6 +40,8 @@ import org.mustangproject.FileAttachment;
 import org.mustangproject.XMLTools;
 import org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants;
 
+import static org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants.CORRECTEDINVOICE;
+
 public class ZUGFeRD2PullProvider implements IXMLProvider {
 
 	//// MAIN CLASS
@@ -229,7 +231,7 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 			paymentTermsDescription = trans.getPaymentTermDescription();
 		}
 
-		if ((paymentTermsDescription == null) && (trans.getDocumentCode() != org.mustangproject.ZUGFeRD.model.DocumentCodeTypeConstants.CORRECTEDINVOICE)) {
+		if ((paymentTermsDescription == null) && (trans.getDocumentCode() != CORRECTEDINVOICE)/* && (trans.getDocumentCode() != DocumentCodeTypeConstants.CREDITNOTE)*/) {
 			paymentTermsDescription = "Zahlbar ohne Abzug bis " + germanDateFormat.format(trans.getDueDate());
 
 		}
@@ -494,7 +496,7 @@ public class ZUGFeRD2PullProvider implements IXMLProvider {
 				}
 			}
 		}
-		if (trans.getDocumentCode() == DocumentCodeTypeConstants.CORRECTEDINVOICE) {
+		if ((trans.getDocumentCode() == CORRECTEDINVOICE)/*||(trans.getDocumentCode() == DocumentCodeTypeConstants.CREDITNOTE)*/) {
 			hasDueDate = false;
 		}
 
diff --git a/library/src/main/java/org/mustangproject/ZUGFeRD/model/DocumentCodeTypeConstants.java b/library/src/main/java/org/mustangproject/ZUGFeRD/model/DocumentCodeTypeConstants.java
index 96855ea4..bbc2a7ac 100644
--- a/library/src/main/java/org/mustangproject/ZUGFeRD/model/DocumentCodeTypeConstants.java
+++ b/library/src/main/java/org/mustangproject/ZUGFeRD/model/DocumentCodeTypeConstants.java
@@ -20,7 +20,7 @@ package org.mustangproject.ZUGFeRD.model;
 
 public class DocumentCodeTypeConstants {
 	public static final String INVOICE = "380";
+	public static final String CREDITNOTE = "381";
 	public static final String DEBITNOTE = "84";
 	public static final String CORRECTEDINVOICE = "384";
-	public static final String CREDITNOTE = "389";
 }
diff --git a/library/src/test/java/org/mustangproject/ZUGFeRD/ZF2PushTest.java b/library/src/test/java/org/mustangproject/ZUGFeRD/ZF2PushTest.java
index c19cf0c7..ea0daf27 100644
--- a/library/src/test/java/org/mustangproject/ZUGFeRD/ZF2PushTest.java
+++ b/library/src/test/java/org/mustangproject/ZUGFeRD/ZF2PushTest.java
@@ -39,6 +39,7 @@ import junit.framework.TestCase;
 public class ZF2PushTest extends TestCase {
 	final String TARGET_PDF = "./target/testout-MustangGnuaccountingBeispielRE-20201121_508.pdf";
 	final String TARGET_ALLOWANCESPDF = "./target/testout-ZF2PushAllowances.pdf";
+	final String TARGET_CREDITNOTEPDF = "./target/testout-ZF2PushCreditNote.pdf";
 	final String TARGET_CORRECTIONPDF = "./target/testout-ZF2PushCorrection.pdf";
 	final String TARGET_ITEMCHARGESALLOWANCESPDF = "./target/testout-ZF2PushItemChargesAllowances.pdf";
 	final String TARGET_CHARGESALLOWANCESPDF = "./target/testout-ZF2PushChargesAllowances.pdf";
@@ -501,6 +502,11 @@ public class ZF2PushTest extends TestCase {
 	}
 
 
+	/***
+	 * German Stornorechnung/Rechnungskorrektur:
+	 * quantities have to be negative!
+	 * official example: zugferd_2p1_EXTENDED_Rechnungskorrektur.pdf
+	 */
 	public void testCorrectionExport() {
 
 		String orgname = "Test company";
@@ -545,5 +551,54 @@ public class ZF2PushTest extends TestCase {
 
 	}
 
+	/***
+	 * UNTDID 1001 says 381 as typecode for credit notes and
+	 * the Factur-X 1.0.50 has examples like Avoir_FR_type381_EN16931.pdf
+	 * along with a documentation in chapter 7.1.6 (where they also tackle
+	 * negative TypeCode 380 invoices)
+	 */
+	public void testCreditNoteExport() {
+
+		String orgname = "Test company";
+		String number = "123";
+		String priceStr = "1.00";
+		BigDecimal price = new BigDecimal(priceStr);
+		BigDecimal qty = new BigDecimal(1.0);
+		try (InputStream SOURCE_PDF = this.getClass()
+				.getResourceAsStream("/MustangGnuaccountingBeispielRE-20170509_505blanko.pdf");
+
+			 ZUGFeRDExporterFromA1 ze = new ZUGFeRDExporterFromA1().setProducer("My Application")
+					 .setCreator(System.getProperty("user.name")).setZUGFeRDVersion(2).ignorePDFAErrors()
+					 .load(SOURCE_PDF)) {
+			Invoice i = new Invoice().setIssueDate(new Date()).setDueDate(new Date()).setDetailedDeliveryPeriod(new Date(), new Date()).setDeliveryDate(new Date()).setSender(new TradeParty(orgname, "teststr", "55232", "teststadt", "DE").addTaxID("4711").addVATID("DE0815").addBankDetails(new BankDetails("DE88200800000970375700", "COBADEFFXXX"))).setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE").addVATID("DE0815")).setNumber(number)
+					.addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), price, qty))
+					.addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), price, qty))
+					.addItem(new Item(new Product("Testprodukt", "", "C62", new BigDecimal(19)), price, qty)).setCreditNote();
+			ze.setTransaction(i);
+			String theXML = new String(ze.getProvider().getXML());
+			assertTrue(theXML.contains("<rsm:CrossIndustryInvoice"));
+			ze.export(TARGET_CREDITNOTEPDF);
+		} catch (IOException e) {
+			fail("IOException should not be raised in testEdgeExport");
+		}
+
+		// now check the contents (like MustangReaderTest)
+		ZUGFeRDImporter zi = new ZUGFeRDImporter(TARGET_CREDITNOTEPDF);
+
+		assertTrue(zi.getUTF8().contains("EUR"));
+//totest: typecode 384, BuyerOrderReferencedDocument
+		// Reading ZUGFeRD
+		assertEquals("3.57", zi.getAmount());
+		assertEquals(zi.getHolder(), orgname);
+		assertEquals(zi.getForeignReference(), number);
+		try {
+			assertEquals(zi.getVersion(), 2);
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+
+
+	}
+
 
 }
diff --git a/pom.xml b/pom.xml
index 1769dd20..8f314cb8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
     <artifactId>core</artifactId>
-    <version>2.0.3-SNAPSHOT</version>
+    <version>2.0.4-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>Mustang</name>
 
diff --git a/validator/pom.xml b/validator/pom.xml
index 0868f732..16990f77 100644
--- a/validator/pom.xml
+++ b/validator/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>org.mustangproject</groupId>
         <artifactId>core</artifactId>
-        <version>2.0.3-SNAPSHOT</version>
+        <version>2.0.4-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.mustangproject</groupId>
@@ -11,7 +11,7 @@
     <name>Library to validate e-invoices (ZUGFeRD, Factur-X and Xrechnung)</name>
 
     <packaging>jar</packaging>
-    <version>2.0.3-SNAPSHOT</version>
+    <version>2.0.4-SNAPSHOT</version>
     <repositories>
         <repository>
             <!-- for jargs -->
@@ -75,7 +75,7 @@
         <dependency>
             <groupId>org.mustangproject</groupId>
             <artifactId>library</artifactId>
-            <version>2.0.3-SNAPSHOT</version>
+            <version>2.0.4-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>org.xmlunit</groupId>