diff --git a/aas_test_engines/test_cases/v3_0/model.py b/aas_test_engines/test_cases/v3_0/model.py
index 3a2716d..ac0c6de 100644
--- a/aas_test_engines/test_cases/v3_0/model.py
+++ b/aas_test_engines/test_cases/v3_0/model.py
@@ -24,11 +24,11 @@ def __init_subclass__(cls, max_len_text):
     def check_language(self):
         if not is_bcp_lang_string(self.language):
             raise CheckConstraintException("Property 'language' does not contain a language")
-        if len(self.language) <= 1:
+        if len(self.language) < 1:
             raise CheckConstraintException("property 'language' must not be empty")
 
     def check_text(self):
-        if len(self.text) <= 1:
+        if len(self.text) < 1:
             raise CheckConstraintException("Property 'text' must not be empty")
         if len(self.text) > self._max_len_text:
             raise CheckConstraintException(f"Property 'text' is too long ({len(self.text)} > {self._max_len_text}")
diff --git a/aas_test_engines/test_cases/v3_0/parse.py b/aas_test_engines/test_cases/v3_0/parse.py
index 0c4a0fb..3ecdf3b 100644
--- a/aas_test_engines/test_cases/v3_0/parse.py
+++ b/aas_test_engines/test_cases/v3_0/parse.py
@@ -86,7 +86,7 @@ def __eq__(self, other: "StringFormattedValue") -> bool:
         return self.raw_value == other.raw_value
 
     def __str__(self) -> str:
-        return f"*{self.raw_value}"
+        return self.raw_value
 
 
 def parse_string_formatted_value(cls, value: Adapter, result: AasTestResult) -> StringFormattedValue:
@@ -166,17 +166,27 @@ def parse_concrete_object(cls, adapter: Adapter, result: AasTestResult):
             result.append(AasTestResult(f"Model typ missing @ {adapter.path}", level=Level.ERROR))
 
     args = {}
+    all_fields = set()
     for field in fields(cls):
         field_name = to_lower_camel_case(field.name)
+        all_fields.add(field_name)
         required, field_type = unwrap_optional(field.type)
         try:
             obj_value = obj[field_name]
         except KeyError:
             if required:
-                result.append(AasTestResult(f"Missing attribute {field_name}", level=Level.ERROR))
-            args[field.name] = None
+                result.append(AasTestResult(f"Missing attribute {field_name} @ {adapter.path}", level=Level.ERROR))
+                args[field.name] = INVALID
+            else:
+                args[field.name] = None
             continue
         args[field.name] = parse(field_type, obj_value, result)
+
+    # Check unknown additional attributes
+    for key in obj.keys():
+        if key not in all_fields:
+            result.append(AasTestResult(f"Unknown additional attribute {key} @ {adapter.path}", level=Level.ERROR))
+
     return cls(**args)
 
 
@@ -210,11 +220,13 @@ def parse(cls, obj_value: Adapter, result: AasTestResult):
             return parse_enum(cls, obj_value, result)
         elif isinstance(cls, StringFormattedValue.__class__):
             return parse_string_formatted_value(cls, obj_value, result)
-    print(origin)
-    print(getattr(cls, '__args__', None))
-    print(obj_value)
-    print(cls)
-    raise NotImplementedError()
+    raise NotImplementedError(
+        f"There is no parsing implemented for:\n"
+        f"  origin:    {origin}\n"
+        f"  args:      {getattr(cls, '__args__', None)}\n"
+        f"  obj_value: {obj_value}\n"
+        f"  cls:       {cls}\n"
+    )
 
 
 def check_constraints(obj, result: AasTestResult, path: AdapterPath = AdapterPath()):
@@ -246,8 +258,10 @@ def _parse_and_check(cls, adapter: Adapter) -> Tuple[object, AasTestResult]:
         result_root.append(result_constraints)
     return result_root, env
 
-def parse_and_check_json(cls, value: any) -> Tuple[object, AasTestResult]:
+
+def parse_and_check_json(cls, value: any) -> Tuple[AasTestResult, object]:
     return _parse_and_check(cls, JsonAdapter(value, AdapterPath()))
 
-def parse_and_check_xml(cls, value: any) -> Tuple[object, AasTestResult]:
-    return _parse_and_check(cls, XmlAdapter(value, AdapterPath()))
\ No newline at end of file
+
+def parse_and_check_xml(cls, value: any) -> Tuple[AasTestResult, object]:
+    return _parse_and_check(cls, XmlAdapter(value, AdapterPath()))