diff --git a/pipelines/steps/update_actris_header.py b/pipelines/steps/update_actris_header.py
new file mode 100644
index 0000000..6e2258b
--- /dev/null
+++ b/pipelines/steps/update_actris_header.py
@@ -0,0 +1,129 @@
+import sys, os
+
+try:
+    thisFilePath = os.path.abspath(__file__)
+    print(thisFilePath)
+except NameError:
+    print("[Notice] The __file__ attribute is unavailable in this environment (e.g., Jupyter or IDLE).")
+    print("When using a terminal, make sure the working directory is set to the script's location to prevent path issues (for the DIMA submodule)")
+    #print("Otherwise, path to submodule DIMA may not be resolved properly.")
+    thisFilePath = os.getcwd()  # Use current directory or specify a default
+
+projectPath = os.path.normpath(os.path.join(thisFilePath, "..", "..",'..'))  # Move up to project root
+
+if projectPath not in sys.path:
+    sys.path.insert(0,projectPath)
+
+import yaml
+import re
+import argparse
+
+def flatten_yaml(data, sep=', '):
+    """Flatten only nested values in the YAML dict by joining dict values into strings."""
+    flat = {}
+    for k, v in data.items():
+        if isinstance(v, dict):
+            # Join all values in the dict as a single string with separator
+            flat[k] = sep.join(str(val) for val in v.values())
+        else:
+            flat[k] = v
+    return flat
+
+def load_template(path):
+    with open(path, 'r') as f:
+        return f.read()
+
+def load_yaml(path):
+    with open(path, 'r') as f:
+        metadata = yaml.safe_load(f)
+        actris_metadata = {
+            'originator': metadata['originator'],
+            'submitter': metadata['submitter'],
+            'station': metadata['station'],
+        }
+        actris_metadata['originator_name'] = metadata['originator'].get('name', '')
+        return flatten_yaml(actris_metadata)
+
+def resolve_project_path():
+    try:
+        thisFilePath = os.path.abspath(__file__)
+    except NameError:
+        thisFilePath = os.getcwd()
+    return os.path.normpath(os.path.join(thisFilePath, "..", "..", ".."))
+
+def fill_placeholders(template, data):
+    def replacer(match):
+        key = match.group(1)
+        return str(data.get(key, f"${{{key}}}"))  # Leave placeholder if not found
+    return re.sub(r'\$\{(\w+)\}', replacer, template)
+
+def main(data_descriptor_path, dry_run = None):
+
+
+    if not os.path.exists(data_descriptor_path):
+        raise FileNotFoundError(f'Data descriptor not found at: {data_descriptor_path}')
+
+    metadata = load_yaml(data_descriptor_path)
+    print(metadata)
+
+    station = metadata.get('station', None)
+    if not station:
+        raise RuntimeError(
+            f'"station" is not defined in {data_descriptor_path}. '
+            'Make sure you specify it as station: "JFJ" or station: "PAY"'
+        )
+
+    # Define header paths
+    header_template_map = {
+        "JFJ": "pipelines/actris_header/JFJ_ACSM_017.actris_header",
+        "PAY": "pipelines/actris_header/PAY_ACSM_092.actris_header",
+    }
+
+    header_uptate_map = {
+        "JFJ": "third_party/acsmProcessingSoftware/src/cfg/actris_header/JFJ_ACSM_017.actris_header",
+        "PAY": "third_party/acsmProcessingSoftware/src/cfg/actris_header/PAY_ACSM_092.actris_header",
+    }
+
+    if station not in header_template_map:
+        raise RuntimeError(f'Station "{station}" is not supported. Choose from: {list(header_template_map)}')
+
+    #projectPath = resolve_project_path()
+    header_path = os.path.join(projectPath, header_template_map[station])
+
+    if not os.path.exists(header_path):
+        raise FileNotFoundError(f"Header template not found at: {header_path}")
+
+    print(f"Using template: {header_path}")
+    template_str = load_template(header_path)
+    filled = fill_placeholders(template_str, metadata)
+
+    if dry_run:
+        out_path = "output.test.ext"
+        print("[DRY RUN] Target header was not overwritten.")
+    else:
+        out_path = os.path.join(projectPath, header_uptate_map[station])
+        print("[LIVE RUN] Target header will be updated.")
+        print(f"Writing to: {out_path}")
+
+    
+    
+
+    with open(out_path, 'w') as f:
+        f.write(filled)
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Fill ACTRIS header from metadata descriptor.")
+    parser.add_argument(
+        "data_descriptor_path",
+        help="Path to metadata YAML (data descriptor)"
+    )
+    parser.add_argument(
+        "--dry-run", "-d",
+        action="store_true",
+        help="Do not overwrite original template. Write output to 'output.test.ext'."
+    )
+    args = parser.parse_args()
+
+    data_descriptor_path = args.data_descriptor_path
+    dry_run = args.dry_run
+    main(data_descriptor_path,dry_run )
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