diff --git a/infra/schema/src/main/java/com/evolveum/midpoint/schema/util/ObjectTypeUtil.java b/infra/schema/src/main/java/com/evolveum/midpoint/schema/util/ObjectTypeUtil.java
index 2e7ccc4b78c..ada0fb9438a 100644
--- a/infra/schema/src/main/java/com/evolveum/midpoint/schema/util/ObjectTypeUtil.java
+++ b/infra/schema/src/main/java/com/evolveum/midpoint/schema/util/ObjectTypeUtil.java
@@ -44,13 +44,8 @@
 
 import javax.xml.datatype.XMLGregorianCalendar;
 import javax.xml.namespace.QName;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.List;
+import java.util.*;
 
-import static java.util.Collections.emptySet;
-import static java.util.Collections.singleton;
 import static org.apache.commons.collections4.CollectionUtils.emptyIfNull;
 
 /**
@@ -872,4 +867,40 @@ public static <O extends ObjectType> XMLGregorianCalendar getLastTouchTimestamp(
 		}
 		return metadata.getCreateTimestamp();
 	}
+
+	@NotNull
+	public static List<Item<?, ?>> mapToExtensionItems(Map<QName, Object> values, PrismContainerDefinition<?> extensionDefinition,
+			PrismContext prismContext) throws SchemaException {
+		List<Item<?, ?>> extensionItems = new ArrayList<>();
+		for (Map.Entry<QName, Object> entry : values.entrySet()) {
+			ItemDefinition<Item<PrismValue, ItemDefinition>> def = extensionDefinition != null
+					? extensionDefinition.findItemDefinition(entry.getKey())
+					: null;
+			if (def == null) {
+				//noinspection unchecked
+				def = prismContext.getSchemaRegistry().findItemDefinitionByElementName(entry.getKey());     // a bit of hack here
+				if (def == null) {
+					throw new SchemaException("No definition of " + entry.getKey() + " in task extension");
+				}
+			}
+			Item<PrismValue, ItemDefinition> extensionItem = def.instantiate();
+			if (entry.getValue() != null) {
+				if (entry.getValue() instanceof Collection) {
+					for (Object value : (Collection) entry.getValue()) {
+						addRealValue(extensionItem, value);
+					}
+				} else {
+					addRealValue(extensionItem, entry.getValue());
+				}
+			}
+			extensionItems.add(extensionItem);
+		}
+		return extensionItems;
+	}
+
+	private static void addRealValue(Item<PrismValue, ItemDefinition> extensionItem, Object value) throws SchemaException {
+    	if (value != null) {
+		    extensionItem.add(PrismValue.fromRealValue(value).clone());
+	    }
+	}
 }
diff --git a/model/model-common/src/main/java/com/evolveum/midpoint/model/common/expression/functions/BasicExpressionFunctions.java b/model/model-common/src/main/java/com/evolveum/midpoint/model/common/expression/functions/BasicExpressionFunctions.java
index 6abfd6f14dd..3ba55eacfc9 100644
--- a/model/model-common/src/main/java/com/evolveum/midpoint/model/common/expression/functions/BasicExpressionFunctions.java
+++ b/model/model-common/src/main/java/com/evolveum/midpoint/model/common/expression/functions/BasicExpressionFunctions.java
@@ -20,12 +20,7 @@
 import java.text.Normalizer;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Date;
-import java.util.LinkedList;
-import java.util.List;
+import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -37,8 +32,10 @@
 import javax.naming.ldap.LdapName;
 import javax.naming.ldap.Rdn;
 import javax.xml.datatype.XMLGregorianCalendar;
+import javax.xml.namespace.QName;
 
 import com.evolveum.midpoint.prism.*;
+import com.evolveum.midpoint.util.QNameUtil;
 import com.evolveum.midpoint.xml.ns._public.common.common_3.*;
 import com.evolveum.prism.xml.ns._public.types_3.ItemPathType;
 import org.apache.commons.io.FileUtils;
@@ -551,6 +548,16 @@ public Collection<String> getAttributeStringValues(ShadowType shadow, javax.xml.
         return ShadowUtil.getAttributeValues(shadow, attributeQname, String.class);
     }
 
+    public void setExtensionRealValues(PrismContainerValue<?> containerValue, Map<String, Object> map) throws SchemaException {
+        PrismContainer<Containerable> ext = containerValue.findOrCreateContainer(ObjectType.F_EXTENSION);
+        Map<QName, Object> qnameKeyedMap = new HashMap<>();
+        map.forEach((uri, value) -> qnameKeyedMap.put(QNameUtil.uriToQName(uri, true), value));
+        List<Item<?, ?>> items = ObjectTypeUtil.mapToExtensionItems(qnameKeyedMap, ext.getDefinition(), prismContext);
+        for (Item<?, ?> item : items) {
+            ext.getValue().addReplaceExisting(item);
+        }
+    }
+
     public <T> T getIdentifierValue(ShadowType shadow) throws SchemaException {
         if (shadow == null) {
             return null;
diff --git a/model/model-impl/src/main/java/com/evolveum/midpoint/model/impl/controller/ModelInteractionServiceImpl.java b/model/model-impl/src/main/java/com/evolveum/midpoint/model/impl/controller/ModelInteractionServiceImpl.java
index 13c3165a5a4..29aa21d7371 100644
--- a/model/model-impl/src/main/java/com/evolveum/midpoint/model/impl/controller/ModelInteractionServiceImpl.java
+++ b/model/model-impl/src/main/java/com/evolveum/midpoint/model/impl/controller/ModelInteractionServiceImpl.java
@@ -28,6 +28,7 @@
 import javax.xml.namespace.QName;
 
 import com.evolveum.midpoint.prism.*;
+import com.evolveum.midpoint.repo.common.expression.*;
 import com.evolveum.midpoint.xml.ns._public.common.common_3.*;
 import org.apache.commons.lang.BooleanUtils;
 import org.apache.commons.lang.Validate;
@@ -104,10 +105,6 @@
 import com.evolveum.midpoint.repo.api.RepositoryService;
 import com.evolveum.midpoint.repo.cache.RepositoryCache;
 import com.evolveum.midpoint.repo.common.CacheRegistry;
-import com.evolveum.midpoint.repo.common.expression.ExpressionFactory;
-import com.evolveum.midpoint.repo.common.expression.ExpressionVariables;
-import com.evolveum.midpoint.repo.common.expression.ItemDeltaItem;
-import com.evolveum.midpoint.repo.common.expression.ObjectDeltaObject;
 import com.evolveum.midpoint.schema.GetOperationOptions;
 import com.evolveum.midpoint.schema.ObjectDeltaOperation;
 import com.evolveum.midpoint.schema.ResourceShadowDiscriminator;
@@ -1722,24 +1719,10 @@ public TaskType submitTaskFromTemplate(String templateTaskOid, List<Item<?, ?>>
 	public TaskType submitTaskFromTemplate(String templateTaskOid, Map<QName, Object> extensionValues, Task opTask, OperationResult parentResult)
 			throws CommunicationException, ObjectNotFoundException, SchemaException, SecurityViolationException,
 			ConfigurationException, ExpressionEvaluationException, ObjectAlreadyExistsException, PolicyViolationException {
-		List<Item<?, ?>> extensionItems = new ArrayList<>();
 		PrismContainerDefinition<?> extDef = prismContext.getSchemaRegistry()
 				.findObjectDefinitionByCompileTimeClass(TaskType.class).findContainerDefinition(TaskType.F_EXTENSION);
-		for (Map.Entry<QName, Object> entry : extensionValues.entrySet()) {
-			ItemDefinition<Item<PrismValue, ItemDefinition>> def = extDef.findItemDefinition(entry.getKey());
-			if (def == null) {
-				//noinspection unchecked
-				def = prismContext.getSchemaRegistry().findItemDefinitionByElementName(entry.getKey());     // a bit of hack here
-				if (def == null) {
-					throw new SchemaException("No definition of " + entry.getKey() + " in task extension");
-				}
-			}
-			Item<PrismValue, ItemDefinition> extensionItem = def.instantiate();
-			if (entry.getValue() != null) {
-				extensionItem.add(PrismValue.fromRealValue(entry.getValue()).clone());
-			}
-			extensionItems.add(extensionItem);
-		}
+		List<Item<?, ?>> extensionItems = ObjectTypeUtil.mapToExtensionItems(extensionValues, extDef, prismContext);
 		return submitTaskFromTemplate(templateTaskOid, extensionItems, opTask, parentResult);
 	}
+
 }