correction of interface based intra community supply

library/src/main/java/org/mustangproject/ZUGFeRD/IZUGFeRDExportableProduct.java

@@ -1,21 +1,23 @@
-/** **********************************************************************
- *
+/**
+ * *********************************************************************
+ * <p>
  * Copyright 2018 Jochen Staerk
- *
+ * <p>
  * Use is subject to license terms.
- *
+ * <p>
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy
  * of the License at http://www.apache.org/licenses/LICENSE-2.0.
- *
+ * <p>
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *
+ * <p>
  * See the License for the specific language governing permissions and
  * limitations under the License.
- *
- *********************************************************************** */
+ * <p>
+ * **********************************************************************
+ */
 package org.mustangproject.ZUGFeRD;
 
 import java.math.BigDecimal;
@@ -78,7 +80,7 @@ public interface IZUGFeRDExportableProduct {
 	/**
 	 * Get the ID that had been assigned by the seller to
 	 * identify the product
-	 * 
+	 *
 	 * @return seller assigned product ID
 	 */
 	default String getSellerAssignedID() {
@@ -88,33 +90,34 @@ public interface IZUGFeRDExportableProduct {
 	/**
 	 * Get the ID that had been assigned by the buyer to
 	 * identify the product
-	 * 
+	 *
 	 * @return buyer assigned product ID
 	 */
 	default String getBuyerAssignedID() {
 		return null;
 	}
+
 	/**
 	 * VAT percent of the product (e.g. 19, or 5.1 if you like)
 	 *
 	 * @return VAT percent of the product
 	 */
 	BigDecimal getVATPercent();
-	
+
 	default boolean isIntraCommunitySupply() {
 		return false;
 	}
-	
+
 	default String getTaxCategoryCode() {
-		if (getVATPercent().equals(new BigDecimal(0))) {
+		if (isIntraCommunitySupply()) {
+			return "K";
+		} else if (getVATPercent().equals(new BigDecimal(0))) {
 			return "Z"; // zero rated goods
-		} else if (isIntraCommunitySupply()) {
-			 return "K";
-		 } else {
-			 return "S"; // one of the "standard" rates (not neccessarily a default rate, even a deducted VAT is standard calculation)
-		 }
-	 }
-	
+		} else {
+			return "S"; // one of the "standard" rates (not neccessarily a default rate, even a deducted VAT is standard calculation)
+		}
+	}
+
 	default String getTaxExemptionReason() {
 		if (isIntraCommunitySupply())
 			return "Intra-community supply";