diff --git a/src/caosadvancedtools/table_json_conversion/validation_utils.py b/src/caosadvancedtools/table_json_conversion/_validation_utils.py
similarity index 97%
rename from src/caosadvancedtools/table_json_conversion/validation_utils.py
rename to src/caosadvancedtools/table_json_conversion/_validation_utils.py
index f1e77f48f7120c5dcd812cb42ba4757a06deb762..5dfd171e48a8141d27f52511e716ddeed75edd89 100644
--- a/src/caosadvancedtools/table_json_conversion/validation_utils.py
+++ b/src/caosadvancedtools/table_json_conversion/_validation_utils.py
@@ -30,8 +30,8 @@ from typing import Union
 import jsonschema
 
 
-def _validate_jsonschema(instance: Union[dict, int, str, bool],
-                         schema: Union[str, dict]):
+def validate_jsonschema(instance: Union[dict, int, str, bool],
+                        schema: Union[str, dict]):
     """
     A table_json_conversion compatible variant of jsonschema.validate().
     Accepts instances with datetime instances and None in not-nullable entries.
diff --git a/src/caosadvancedtools/table_json_conversion/convert.py b/src/caosadvancedtools/table_json_conversion/convert.py
index 33432b85298f98125dc7861fad82d220a6d4b5aa..dc2126d7bc7d3cff270e9920b6dea392be2a9348 100644
--- a/src/caosadvancedtools/table_json_conversion/convert.py
+++ b/src/caosadvancedtools/table_json_conversion/convert.py
@@ -36,7 +36,7 @@ import jsonschema
 from openpyxl import load_workbook
 from openpyxl.worksheet.worksheet import Worksheet
 
-from .validation_utils import _validate_jsonschema
+from ._validation_utils import validate_jsonschema
 from caosadvancedtools.table_json_conversion import xlsx_utils
 from caosadvancedtools.table_json_conversion.fill_xlsx import read_or_dict
 
@@ -329,7 +329,7 @@ class XLSXConverter:
                                      for e in exceptions])
                 raise jsonschema.ValidationError(mess)
         if validate:
-            _validate_jsonschema(self._result, self._schema)
+            validate_jsonschema(self._result, self._schema)
         if self._errors:
             raise RuntimeError("There were error while handling the XLSX file.")
         return self._result
@@ -564,7 +564,7 @@ class XLSXConverter:
                 value = False
             if value == 1 or isinstance(value, str) and '=true()' == value.lower():
                 value = True
-        _validate_jsonschema(value, subschema)
+        validate_jsonschema(value, subschema)
 
         # Finally: convert to target type
         return self.PARSER[subschema.get("type", "string")](value)
diff --git a/src/caosadvancedtools/table_json_conversion/fill_xlsx.py b/src/caosadvancedtools/table_json_conversion/fill_xlsx.py
index 1f39f66d38c27c41389ce14a184671a4be23271b..e6268fd63e4b436ec8ae86d35b865e3d7faa9b03 100644
--- a/src/caosadvancedtools/table_json_conversion/fill_xlsx.py
+++ b/src/caosadvancedtools/table_json_conversion/fill_xlsx.py
@@ -33,7 +33,7 @@ from jsonschema.exceptions import ValidationError
 from openpyxl import load_workbook, Workbook
 from openpyxl.cell.cell import ILLEGAL_CHARACTERS_RE
 
-from .validation_utils import _validate_jsonschema
+from ._validation_utils import validate_jsonschema
 from .xlsx_utils import (
     array_schema_from_model_schema,
     get_foreign_key_columns,
@@ -360,7 +360,7 @@ validation_schema: dict, optional
             if list(validation_schema['properties'].values())[0]["type"] != "array":
                 validation_schema = array_schema_from_model_schema(read_or_dict(validation_schema))
         try:
-            _validate_jsonschema(data, validation_schema)
+            validate_jsonschema(data, validation_schema)
         except ValidationError as verr:
             print(verr.message)
             raise verr