diff --git a/invenio_records_lom/resources/serializers/oai/schema.py b/invenio_records_lom/resources/serializers/oai/schema.py
index 8b84897..999693e 100644
--- a/invenio_records_lom/resources/serializers/oai/schema.py
+++ b/invenio_records_lom/resources/serializers/oai/schema.py
@@ -9,7 +9,7 @@
 
 from copy import copy
 
-from marshmallow import EXCLUDE, Schema, fields, pre_load, validate, validates_schema
+from marshmallow import EXCLUDE, Schema, fields, pre_dump, validate, validates_schema
 
 from ....services.schemas.metadata import validate_cc_license_lang
 from ....utils import make_lom_vcard
@@ -221,11 +221,12 @@ def get_centity(self, contributors: dict) -> list:
 class LifecycleSchema(ExcludeUnknownOrderedSchema):
     """Schema for LOM-UIBK's `lifecycle` category."""
 
+    datetime = fields.String()
     version = fields.Field()
     status = fields.Field()
     contribute = fields.List(fields.Nested(ContributeSchema()))
 
-    @pre_load
+    @pre_dump
     def group_contributes_by_role(self, data: dict, **__: dict) -> dict:
         """Group contributes by role."""
         contributions_by_role = {}
@@ -308,12 +309,12 @@ class LearningResourceTypeSchema(ExcludeUnknownOrderedSchema):
         validate=validate.Equal(LANGSTRING_KIM_HCRT_SCHEME),
         dump_default=LANGSTRING_KIM_HCRT_SCHEME,
     )
-    id = fields.Str(required=True, dump_default="N/A")
+    id = fields.Str(required=True, dump_default="https://w3id.org/kim/hcrt/other")
 
     @classmethod
     def dump_default(cls) -> dict:
         """Dump default."""
-        obj = {"id": "N/A"}
+        obj = {"id": "https://w3id.org/kim/hcrt/other"}
         obj |= {"source": LANGSTRING_KIM_HCRT_SCHEME}
         return obj
 
diff --git a/invenio_records_lom/services/schemas/metadata.py b/invenio_records_lom/services/schemas/metadata.py
index dbf36fe..f29be0e 100644
--- a/invenio_records_lom/services/schemas/metadata.py
+++ b/invenio_records_lom/services/schemas/metadata.py
@@ -9,6 +9,7 @@
 
 from collections.abc import Callable
 from copy import copy
+from datetime import datetime, timezone
 from types import MappingProxyType
 
 from invenio_i18n import lazy_gettext as _
@@ -25,6 +26,15 @@
 from marshmallow_utils.html import sanitize_unicode
 
 
+def now_isoformat() -> str:
+    """Return current date and time in ISO-8601 format.
+
+    example-return: '2020-06-24T05:34:56.789123'
+    """
+    now_unaware = datetime.now(timezone.utc).replace(tzinfo=None)
+    return now_unaware.isoformat()
+
+
 class NoValidationSchema(Schema):
     """Let data through unchanged, without validation."""
 
@@ -250,6 +260,7 @@ class ContributeSchema(Schema):
 class LifecycleSchema(Schema):
     """Schema for LOM's `lifecycle` category."""
 
+    datetime = fields.String(load_default=now_isoformat)
     contribute = fields.List(
         fields.Nested(ContributeSchema()),
         required=True,