diff --git a/src/java/ABTProductsPUTGenerator/src/main/java/nl/htm/ovpay/abt/ABTProductsPUTGenerator.java b/src/java/ABTProductsPUTGenerator/src/main/java/nl/htm/ovpay/abt/ABTProductsPUTGenerator.java
index 3246d16..69426ac 100644
--- a/src/java/ABTProductsPUTGenerator/src/main/java/nl/htm/ovpay/abt/ABTProductsPUTGenerator.java
+++ b/src/java/ABTProductsPUTGenerator/src/main/java/nl/htm/ovpay/abt/ABTProductsPUTGenerator.java
@@ -100,8 +100,8 @@ public class ABTProductsPUTGenerator {
                 ((ObjectNode)newJsonNode).putRawValue("customerSegmentIds", null);
             }
             case "allowedGboAgeProfiles" -> {
-                LOGGER.info("Rewriting null allowedGboAgeProfiles to allowedGboAgeProfilesIds...");
-                ((ObjectNode)newJsonNode).putRawValue("allowedGboAgeProfilesIds", null);
+                LOGGER.info("Rewriting null allowedGboAgeProfiles to allowedGboAgeProfileIds...");
+                ((ObjectNode)newJsonNode).putRawValue("allowedGboAgeProfileIds", null);
             }
             case "mandatoryCustomerDataItems" -> {
                 LOGGER.info("Rewriting null mandatoryCustomerDataItems to mandatoryCustomerDataItemIds...");
@@ -283,7 +283,8 @@ public class ABTProductsPUTGenerator {
                                 ((ObjectNode)sellingPeriod).putRawValue("forbiddenPaymentMethodIds", null);
                             }
                         }
-                        if (sellingPeriod.get("sellingPrices") != null) {
+                        if (!sellingPeriod.get("sellingPrices").isNull()) {
+                            LOGGER.info("Deep-copying sellingPrices...");
                             ArrayNode sellingPrices = ((ArrayNode)sellingPeriod.get("sellingPrices")).deepCopy();
                             ((ObjectNode)sellingPeriod).remove("sellingPrices");
                             if (!sellingPrices.isEmpty()) {
@@ -299,8 +300,8 @@ public class ABTProductsPUTGenerator {
                 }
             }
             case "purchasePrices" -> {
-                LOGGER.info("Rewriting taxMetadata in purchasePrices to taxMetadataId...");
-                if (jsonField.getValue() != null) {
+                LOGGER.info("Deep-copying purchasePrices...");
+                if (!jsonField.getValue().isNull()) {
                     ArrayNode purchasePrices = ((ArrayNode)jsonField.getValue()).deepCopy();
                     ((ObjectNode)newJsonNode).putArray("purchasePrices").addAll(purchasePrices);
                 } else {