diff --git a/capella2polarion/elements/__init__.py b/capella2polarion/elements/__init__.py
index 35980484..ba119130 100644
--- a/capella2polarion/elements/__init__.py
+++ b/capella2polarion/elements/__init__.py
@@ -33,7 +33,9 @@
 }
 PHYSICAL_COMPONENT_TYPES = {
     "PhysicalComponentNode": "PhysicalComponent",
+    "PhysicalActorNode": "PhysicalComponent",
     "PhysicalComponentBehavior": "PhysicalComponent",
+    "PhysicalActorBehavior": "PhysicalComponent",
 }
 POL2CAPELLA_TYPES: dict[str, str] = (
     {
@@ -163,13 +165,7 @@ def patch_work_items(ctx: dict[str, t.Any]) -> None:
                 new_work_item, back_links[old_work_item.id]
             )
 
-        api_helper.patch_work_item(
-            ctx["API"],
-            new_work_item,
-            old_work_item,
-            old_work_item.title,
-            "element",
-        )
+        api_helper.patch_work_item(ctx["API"], new_work_item, old_work_item)
 
 
 def get_types(ctx: dict[str, t.Any]) -> set[str]:
@@ -234,25 +230,22 @@ def _fix_components(
         elements[typ] = actors
         elements[xtype] = components
 
-    nodes: list[common.GenericElement] = []
-    behaviors: list[common.GenericElement] = []
-    components = []
+    nature_mapping: dict[str, tuple[list[common.GenericElement], str]] = {
+        "UNSET": ([], "PhysicalComponent"),
+        "NODE": ([], "PhysicalComponentNode"),
+        "BEHAVIOR": ([], "PhysicalComponentBehavior"),
+        "NODE_actor": ([], "PhysicalActorNode"),
+        "BEHAVIOR_actor": ([], "PhysicalActorBehavior"),
+    }
     for obj in elements.get("PhysicalComponent", []):
-        if obj.nature is not None and obj.nature.name == "NODE":
-            nodes.append(obj)
-            type_map[obj.uuid] = "PhysicalComponentNode"
-        elif obj.nature is not None and obj.nature.name == "BEHAVIOR":
-            behaviors.append(obj)
-            type_map[obj.uuid] = "PhysicalComponentBehavior"
-        else:
-            components.append(obj)
-
-    if nodes:
-        elements["PhysicalComponentNode"] = nodes
-    if behaviors:
-        elements["PhysicalComponentBehavior"] = behaviors
-    if components:
-        elements["PhysicalComponent"] = components
+        postfix = "_actor" if obj.is_actor else ""
+        container, xtype = nature_mapping[f"{str(obj.nature)}{postfix}"]
+        container.append(obj)
+        type_map[obj.uuid] = xtype
+
+    for container, xtype in nature_mapping.values():
+        if container:
+            elements[xtype] = container
 
 
 def make_model_elements_index(ctx: dict[str, t.Any]) -> None:
diff --git a/capella2polarion/elements/api_helper.py b/capella2polarion/elements/api_helper.py
index b3fef82b..241aaba3 100644
--- a/capella2polarion/elements/api_helper.py
+++ b/capella2polarion/elements/api_helper.py
@@ -16,8 +16,6 @@ def patch_work_item(
     api: polarion_api.OpenAPIPolarionProjectClient,
     new: serialize.CapellaWorkItem,
     old: serialize.CapellaWorkItem,
-    name: str,
-    _type: str,
 ):
     """Patch a given WorkItem.
 
@@ -29,16 +27,11 @@ def patch_work_item(
         The updated CapellaWorkItem
     old
         The CapellaWorkItem currently present on polarion
-    name
-        The name of the object, which should be displayed in log
-        messages.
-    _type
-        The type of element, which should be shown in log messages.
     """
     if new == old:
         return
 
-    log_args = (old.id, _type, name)
+    log_args = (old.id, new.type, new.title)
     logger.info("Update work item %r for model %s %r...", *log_args)
     if "uuid_capella" in new.additional_attributes:
         del new.additional_attributes["uuid_capella"]
@@ -52,18 +45,21 @@ def patch_work_item(
         handle_links(
             old.linked_work_items,
             new.linked_work_items,
-            ("Delete", _type, name),
+            ("Delete", *log_args[1:]),
             api.delete_work_item_links,
         )
         handle_links(
             new.linked_work_items,
             old.linked_work_items,
-            ("Create", _type, name),
+            ("Create", *log_args[1:]),
             api.create_work_item_links,
         )
     except polarion_api.PolarionApiException as error:
-        wi = f"{old.id}({_type} {name})"
-        logger.error("Updating work item %r failed. %s", wi, error.args[0])
+        logger.error(
+            "Updating work item %r (%s %s) failed. %s",
+            *log_args,
+            error.args[0],
+        )
 
 
 def handle_links(
diff --git a/capella2polarion/elements/element.py b/capella2polarion/elements/element.py
index e533f8f1..58611857 100644
--- a/capella2polarion/elements/element.py
+++ b/capella2polarion/elements/element.py
@@ -6,6 +6,7 @@
 import collections.abc as cabc
 import functools
 import logging
+import types
 import typing as t
 from collections import defaultdict
 from itertools import chain
@@ -50,6 +51,8 @@ def create_work_items(
     missing_types: set[str] = set()
     for work_item in _work_items:
         assert work_item is not None
+        assert work_item.title is not None
+        assert work_item.type is not None
         if work_item.type in valid_types:
             work_items.append(work_item)
         else:
@@ -60,7 +63,9 @@ def create_work_items(
             "%r are missing in the capella2polarion configuration",
             ", ".join(missing_types),
         )
-    ctx["WORK_ITEMS"] = {wi.uuid_capella: wi for wi in work_items}
+    ctx["WORK_ITEMS"] = types.MappingProxyType(
+        {wi.uuid_capella: wi for wi in work_items}
+    )
     return work_items
 
 
diff --git a/capella2polarion/elements/serialize.py b/capella2polarion/elements/serialize.py
index c8a1c232..286e3946 100644
--- a/capella2polarion/elements/serialize.py
+++ b/capella2polarion/elements/serialize.py
@@ -23,7 +23,9 @@
 
 from capella2polarion.elements import helpers
 
-RE_DESCR_LINK_PATTERN = re.compile(r"<a href=\"hlink://([^\"]+)\">[^<]+<\/a>")
+RE_DESCR_LINK_PATTERN = re.compile(
+    r"<a href=\"hlink://([^\"]+)\">([^<]+)<\/a>"
+)
 RE_DESCR_DELETED_PATTERN = re.compile(
     f"<deleted element ({chelpers.RE_VALID_UUID.pattern})>"
 )
@@ -143,8 +145,9 @@ def _get_requirement_types_text(
             continue
 
         if not (req.type and req.text):
+            identifier = req.long_name or req.name or req.summary or req.uuid
             logger.warning(
-                "Requirement without text or type found %r", req.name
+                "Requirement without text or type found %r", identifier
             )
             continue
 
@@ -174,7 +177,7 @@ def _sanitize_description(
 ) -> tuple[list[str], markupsafe.Markup]:
     referenced_uuids: list[str] = []
     replaced_markup = RE_DESCR_LINK_PATTERN.sub(
-        lambda match: replace_markup(match, ctx, referenced_uuids), descr
+        lambda match: replace_markup(match, ctx, referenced_uuids, 2), descr
     )
 
     def repair_images(node: etree._Element) -> None:
@@ -208,7 +211,7 @@ def replace_markup(
     match: re.Match,
     ctx: dict[str, t.Any],
     referenced_uuids: list[str],
-    non_matcher: cabc.Callable[[str], str] = lambda i: i,
+    default_group: int = 1,
 ) -> str:
     """Replace UUID references in a ``match`` with a work item link.
 
@@ -216,10 +219,16 @@ def replace_markup(
     text is returned.
     """
     uuid = match.group(1)
+    try:
+        ctx["MODEL"].by_uuid(uuid)
+    except KeyError:
+        logger.error("Found link to non-existing model element: %r", uuid)
+        return strike_through(match.group(default_group))
     if pid := ctx["POLARION_ID_MAP"].get(uuid):
         referenced_uuids.append(uuid)
         return POLARION_WORK_ITEM_URL.format(pid=pid)
-    return non_matcher(match.group(0))
+    logger.warning("Found reference to non-existing work item: %r", uuid)
+    return match.group(default_group)
 
 
 def include_pre_and_post_condition(
@@ -232,11 +241,6 @@ def get_condition(cap: PrePostConditionElement, name: str) -> str:
             return ""
         return condition.specification["capella:linkedText"].striptags()
 
-    def strike_through(string: str) -> str:
-        if match := RE_DESCR_DELETED_PATTERN.match(string):
-            string = match.group(1)
-        return f'<span style="text-decoration: line-through;">{string}</span>'
-
     def matcher(match: re.Match) -> str:
         return strike_through(replace_markup(match, ctx, []))
 
@@ -254,6 +258,13 @@ def matcher(match: re.Match) -> str:
     return work_item
 
 
+def strike_through(string: str) -> str:
+    """Return a striked-through html span from given ``string``."""
+    if match := RE_DESCR_DELETED_PATTERN.match(string):
+        string = match.group(1)
+    return f'<span style="text-decoration: line-through;">{string}</span>'
+
+
 def get_linked_text(
     obj: capellacore.Constraint, ctx: dict[str, t.Any]
 ) -> markupsafe.Markup:
@@ -280,7 +291,7 @@ def _condition(html: bool, value: str) -> CapellaWorkItem.Condition:
     return {"type": _type, "value": value}
 
 
-def component_or_actor(
+def _include_actor_in_type(
     obj: cs.Component, ctx: dict[str, t.Any]
 ) -> CapellaWorkItem:
     """Return attributes for a ``Component``."""
@@ -294,15 +305,15 @@ def component_or_actor(
     return work_item
 
 
-def physical_component(
+def _include_nature_in_type(
     obj: pa.PhysicalComponent, ctx: dict[str, t.Any]
 ) -> CapellaWorkItem:
     """Return attributes for a ``PhysicalComponent``."""
-    work_item = component_or_actor(obj, ctx)
+    work_item = _include_actor_in_type(obj, ctx)
     xtype = work_item.type
-    if obj.nature is not None:
-        # pylint: disable-next=attribute-defined-outside-init
-        work_item.type = f"{xtype}{obj.nature.name.capitalize()}"
+    nature = [obj.nature.name, ""][obj.nature == "UNSET"]
+    # pylint: disable-next=attribute-defined-outside-init
+    work_item.type = f"{xtype}{nature.capitalize()}"
     return work_item
 
 
@@ -311,11 +322,11 @@ def physical_component(
 ]
 SERIALIZERS: dict[str, Serializer] = {
     "CapabilityRealization": include_pre_and_post_condition,
-    "LogicalComponent": component_or_actor,
+    "LogicalComponent": _include_actor_in_type,
     "OperationalCapability": include_pre_and_post_condition,
-    "PhysicalComponent": physical_component,
+    "PhysicalComponent": _include_nature_in_type,
     "SystemCapability": include_pre_and_post_condition,
-    "SystemComponent": component_or_actor,
+    "SystemComponent": _include_actor_in_type,
     "Scenario": include_pre_and_post_condition,
     "Constraint": constraint,
 }
diff --git a/tests/test_elements.py b/tests/test_elements.py
index c9ef64e8..58f1697d 100644
--- a/tests/test_elements.py
+++ b/tests/test_elements.py
@@ -31,8 +31,7 @@
 TEST_WE_UUID = "e37510b9-3166-4f80-a919-dfaac9b696c7"
 TEST_E_UUID = "4bf0356c-89dd-45e9-b8a6-e0332c026d33"
 TEST_WE_DESCR = (
-    '<p><span class="polarion-rte-link" data-type="workItem" '
-    'id="fake" data-item-id="TEST" data-option-id="long"/></p>\n'
+    '<p><span style="text-decoration: line-through;">Weather</span></p>\n'
 )
 TEST_ACTOR_UUID = "08e02248-504d-4ed8-a295-c7682a614f66"
 TEST_PHYS_COMP = "b9f9a83c-fb02-44f7-9123-9d86326de5f1"