diff --git a/csfunctions/events/__init__.py b/csfunctions/events/__init__.py
index d7390b9..d6672ac 100644
--- a/csfunctions/events/__init__.py
+++ b/csfunctions/events/__init__.py
@@ -2,6 +2,12 @@
 
 from pydantic import Field
 
+from .custom_operations import (
+    CustomOperationDocumentData,
+    CustomOperationDocumentEvent,
+    CustomOperationPartData,
+    CustomOperationPartEvent,
+)
 from .dialog_data import DocumentReleasedDialogData, PartReleasedDialogData
 from .document_create_check import DocumentCreateCheckData, DocumentCreateCheckEvent
 from .document_field_calculation import DocumentFieldCalculationData, DocumentFieldCalculationEvent
@@ -41,7 +47,9 @@
     | DocumentCreateCheckEvent
     | DocumentModifyCheckEvent
     | PartCreateCheckEvent
-    | PartModifyCheckEvent,
+    | PartModifyCheckEvent
+    | CustomOperationDocumentEvent
+    | CustomOperationPartEvent,
     Field(discriminator="name"),
 ]
 EventData = (
@@ -62,6 +70,8 @@
     | DocumentModifyCheckData
     | PartCreateCheckData
     | PartModifyCheckData
+    | CustomOperationDocumentData
+    | CustomOperationPartData
 )
 
 __all__ = [
@@ -99,4 +109,8 @@
     "PartCreateCheckEvent",
     "PartModifyCheckData",
     "PartModifyCheckEvent",
+    "CustomOperationDocumentData",
+    "CustomOperationDocumentEvent",
+    "CustomOperationPartData",
+    "CustomOperationPartEvent",
 ]
diff --git a/csfunctions/events/base.py b/csfunctions/events/base.py
index 262db1b..1d4f717 100644
--- a/csfunctions/events/base.py
+++ b/csfunctions/events/base.py
@@ -21,6 +21,8 @@ class EventNames(str, Enum):
     PART_MODIFY_CHECK = "part_modify_check"
     ENGINEERING_CHANGE_STATUS_CHANGED = "engineering_change_status_changed"
     ENGINEERING_CHANGE_STATUS_CHANGE_CHECK = "engineering_change_status_change_check"
+    CUSTOM_OPERATION_DOCUMENT = "custom_operation_document"
+    CUSTOM_OPERATION_PART = "custom_operation_part"
 
 
 class BaseEvent(BaseModel):
diff --git a/csfunctions/events/custom_operations.py b/csfunctions/events/custom_operations.py
new file mode 100644
index 0000000..1738fd8
--- /dev/null
+++ b/csfunctions/events/custom_operations.py
@@ -0,0 +1,39 @@
+from typing import Literal
+
+from pydantic import BaseModel, Field
+
+from csfunctions.objects import Document, Part
+
+from .base import BaseEvent, EventNames
+
+
+# ----------- DOCUMENTS -----------
+class CustomOperationDocumentData(BaseModel):
+    documents: list[Document] = Field(..., description="List of documents that the custom operation was called on")
+    parts: list[Part] = Field(..., description="List of parts that belong to the documents")
+
+
+class CustomOperationDocumentEvent(BaseEvent):
+    """
+    Event triggered when a custom operation is called on a document.
+    """
+
+    name: Literal[EventNames.CUSTOM_OPERATION_DOCUMENT] = EventNames.CUSTOM_OPERATION_DOCUMENT
+    data: CustomOperationDocumentData
+
+
+# ----------- PARTS -----------
+
+
+class CustomOperationPartData(BaseModel):
+    parts: list[Part] = Field(..., description="List of parts that the custom operation was called on")
+    documents: list[Document] = Field(..., description="List of documents that belong to the parts")
+
+
+class CustomOperationPartEvent(BaseEvent):
+    """
+    Event triggered when a custom operation is called on a part.
+    """
+
+    name: Literal[EventNames.CUSTOM_OPERATION_PART] = EventNames.CUSTOM_OPERATION_PART
+    data: CustomOperationPartData
diff --git a/docs/examples/basic_report.md b/docs/examples/basic_report.md
new file mode 100644
index 0000000..1f40e9c
--- /dev/null
+++ b/docs/examples/basic_report.md
@@ -0,0 +1,116 @@
+# Basic Report
+
+This example shows how you can use custom operations to generate a basic report on a document and attach that report to the document.
+
+The example uses [python-docx](https://python-docx.readthedocs.io/en/latest/) to generate a Word file.
+To install the library in your Function, you need to add it to the `requirements.txt`:
+
+```requirements.txt
+contactsoftware-functions
+python-docx
+```
+
+```python
+import os
+import tempfile
+from datetime import datetime
+
+import requests
+from docx import Document as DocxDocument
+
+from csfunctions import MetaData, Service
+from csfunctions.events import CustomOperationDocumentEvent
+from csfunctions.objects import Document
+
+
+def simple_report(metadata: MetaData, event: CustomOperationDocumentEvent, service: Service):
+    """
+    Generates a simple report for each document the custom operation is called on.
+    The report contains basic information about the document and is saved as a new file
+    named "myreport.docx" within the document.
+    """
+
+    for document in event.data.documents:
+        # generate a report for each document
+        report = _create_report(document, metadata)
+
+        temp_file_path = None
+        try:
+            # we need to use a tempfile, because the rest of the filesystem is read-only
+            with tempfile.NamedTemporaryFile(suffix=".docx", delete=False) as tmp:
+                temp_file_path = tmp.name
+            report.save(temp_file_path)
+
+            # check if the document already has a report file, so we can overwrite it
+            file_name = "myreport.docx"
+            existing_file = next((file for file in document.files if file.cdbf_name == file_name), None)
+
+            with open(temp_file_path, "rb") as file_stream:
+                if existing_file:
+                    # overwrite the existing report file
+                    # we set check_access to false to allow attaching reports to released documents
+                    service.file_upload.upload_file_content(
+                        file_object_id=existing_file.cdb_object_id, stream=file_stream, check_access=False
+                    )
+                else:
+                    # create a new one
+                    # we set check_access to false to allow attaching reports to released documents
+                    service.file_upload.upload_new_file(
+                        parent_object_id=document.cdb_object_id,  # type: ignore
+                        filename=file_name,
+                        stream=file_stream,
+                        check_access=False,
+                    )
+        finally:
+            if temp_file_path:
+                # Clean up temp file
+                os.unlink(temp_file_path)
+
+
+def _fetch_person_name(persno: str, metadata: MetaData) -> str | None:
+    """Fetches the name of a person given their personnel number via GraphQL."""
+    graphql_url = str(metadata.db_service_url).rstrip("/") + "/graphql/v1"
+    headers = {"Authorization": f"Bearer {metadata.service_token}"}
+
+    query = f"""
+      {{
+        persons(personalnummer: \"{persno}\", max_rows: 1) {{
+        name
+        }}
+       }}
+    """
+    response = requests.post(
+        graphql_url,
+        headers=headers,
+        json={"query": query},
+    )
+    response.raise_for_status()
+    data = response.json()
+    persons = data["data"]["persons"]
+    if persons:
+        return persons[0]["name"]
+    return None
+
+
+def _create_report(document: Document, metadata: MetaData) -> DocxDocument:
+    """Creates a simple Word report for the given document."""
+    doc = DocxDocument()
+
+    doc.add_heading("Simple Report", 0)
+
+    report_time_string = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
+    doc.add_paragraph(f"Report generated on: {report_time_string}")
+
+    # add some basic information about the document
+    doc.add_heading("Document Information", level=1)
+    doc.add_paragraph(f"Document ID: {document.z_nummer}@{document.z_index}")
+    doc.add_paragraph(f"Title: {document.titel}")
+    doc.add_paragraph(f"Created On: {document.cdb_cdate}")
+
+    # Fetch the name of the person who created the document via GraphQL
+    person_name = _fetch_person_name(document.cdb_cpersno, metadata)
+    doc.add_paragraph(f"Created By: {person_name or document.cdb_cpersno}")
+
+    return doc
+
+```
diff --git a/docs/reference/events.md b/docs/reference/events.md
index 09dd464..452e395 100644
--- a/docs/reference/events.md
+++ b/docs/reference/events.md
@@ -317,3 +317,44 @@ This event is fired when a user tries to modify an engineering change's status.
 | target_status      | int                                               | The status the engineering change will be set to          |
 | documents          | list[[Document](objects.md#document)]             | List of documents attached to the engineering change      |
 | parts              | list[[Part](objects.md#part)]                     | List of parts attached to the engineering change          |
+
+
+## CustomOperationDocumentEvent
+`csfunctions.events.CustomOperationDocumentEvent`
+
+
+This event is triggered when a custom operation is called on one or more documents.
+
+**Supported actions:**
+
+- [StartWorkflowAction](actions.md#startworkflowaction)
+- [AbortAndShowErrorAction](actions.md#abortandshowerroraction)
+
+**CustomOperationDocumentEvent.name:** custom_operation_document
+
+**CustomOperationDocumentEvent.data:**
+
+| Attribute | Type                                  | Description                                                |
+| --------- | ------------------------------------- | ---------------------------------------------------------- |
+| documents | list[[Document](objects.md#document)] | List of documents that the custom operation was called on. |
+| parts     | list[[Part](objects.md#part)]         | List of parts that belong to the documents.                |
+
+## CustomOperationPartEvent
+`csfunctions.events.CustomOperationPartEvent`
+
+
+This event is triggered when a custom operation is called on one or more parts.
+
+**Supported actions:**
+
+- [StartWorkflowAction](actions.md#startworkflowaction)
+- [AbortAndShowErrorAction](actions.md#abortandshowerroraction)
+
+**CustomOperationPartEvent.name:** custom_operation_part
+
+**CustomOperationPartEvent.data:**
+
+| Attribute | Type                                  | Description                                            |
+| --------- | ------------------------------------- | ------------------------------------------------------ |
+| parts     | list[[Part](objects.md#part)]         | List of parts that the custom operation was called on. |
+| documents | list[[Document](objects.md#document)] | List of documents that belong to the parts.            |
diff --git a/json_schemas/request.json b/json_schemas/request.json
index 2040695..3ed5a7d 100644
--- a/json_schemas/request.json
+++ b/json_schemas/request.json
@@ -85,6 +85,108 @@
       "title": "Briefcase",
       "type": "object"
     },
+    "CustomOperationDocumentData": {
+      "properties": {
+        "documents": {
+          "description": "List of documents that the custom operation was called on",
+          "items": {
+            "$ref": "#/$defs/Document"
+          },
+          "title": "Documents",
+          "type": "array"
+        },
+        "parts": {
+          "description": "List of parts that belong to the documents",
+          "items": {
+            "$ref": "#/$defs/Part"
+          },
+          "title": "Parts",
+          "type": "array"
+        }
+      },
+      "required": [
+        "documents",
+        "parts"
+      ],
+      "title": "CustomOperationDocumentData",
+      "type": "object"
+    },
+    "CustomOperationDocumentEvent": {
+      "description": "Event triggered when a custom operation is called on a document.",
+      "properties": {
+        "name": {
+          "const": "custom_operation_document",
+          "default": "custom_operation_document",
+          "title": "Name",
+          "type": "string"
+        },
+        "event_id": {
+          "description": "unique identifier",
+          "title": "Event Id",
+          "type": "string"
+        },
+        "data": {
+          "$ref": "#/$defs/CustomOperationDocumentData"
+        }
+      },
+      "required": [
+        "event_id",
+        "data"
+      ],
+      "title": "CustomOperationDocumentEvent",
+      "type": "object"
+    },
+    "CustomOperationPartData": {
+      "properties": {
+        "parts": {
+          "description": "List of parts that the custom operation was called on",
+          "items": {
+            "$ref": "#/$defs/Part"
+          },
+          "title": "Parts",
+          "type": "array"
+        },
+        "documents": {
+          "description": "List of documents that belong to the parts",
+          "items": {
+            "$ref": "#/$defs/Document"
+          },
+          "title": "Documents",
+          "type": "array"
+        }
+      },
+      "required": [
+        "parts",
+        "documents"
+      ],
+      "title": "CustomOperationPartData",
+      "type": "object"
+    },
+    "CustomOperationPartEvent": {
+      "description": "Event triggered when a custom operation is called on a part.",
+      "properties": {
+        "name": {
+          "const": "custom_operation_part",
+          "default": "custom_operation_part",
+          "title": "Name",
+          "type": "string"
+        },
+        "event_id": {
+          "description": "unique identifier",
+          "title": "Event Id",
+          "type": "string"
+        },
+        "data": {
+          "$ref": "#/$defs/CustomOperationPartData"
+        }
+      },
+      "required": [
+        "event_id",
+        "data"
+      ],
+      "title": "CustomOperationPartEvent",
+      "type": "object"
+    },
     "Document": {
       "description": "Normal Document that doesn't contain a CAD-Model.",
       "properties": {
@@ -7957,6 +8059,8 @@
     "event": {
       "discriminator": {
         "mapping": {
+          "custom_operation_document": "#/$defs/CustomOperationDocumentEvent",
+          "custom_operation_part": "#/$defs/CustomOperationPartEvent",
           "document_create_check": "#/$defs/DocumentCreateCheckEvent",
           "document_field_calculation": "#/$defs/DocumentFieldCalculationEvent",
           "document_modify_check": "#/$defs/DocumentModifyCheckEvent",
@@ -8028,6 +8132,12 @@
         },
         {
           "$ref": "#/$defs/PartModifyCheckEvent"
+        },
+        {
+          "$ref": "#/$defs/CustomOperationDocumentEvent"
+        },
+        {
+          "$ref": "#/$defs/CustomOperationPartEvent"
         }
       ],
       "title": "Event"
diff --git a/mkdocs.yml b/mkdocs.yml
index a48dd2e..67f559f 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -46,6 +46,7 @@ nav:
     - examples/enforce_field_rules.md
     - examples/field_calculation.md
     - examples/workflows.md
+    - examples/basic_report.md
   - Reference:
     - reference/events.md
     - reference/objects.md