This is an issue of the DRF browseable interface. The exception is shown

in the Swagger interface or via CURL.
Revert "Model.save() errors are being silently ignored by Django REST Framework."

This reverts commit 288de26d2b.

mayan/apps/documents/serializers.py

@@ -1,7 +1,6 @@
 from __future__ import unicode_literals
 
 from rest_framework import serializers
-from rest_framework.serializers import ValidationError
 
 from common.models import SharedUploadedFile
 
@@ -82,16 +81,6 @@ class DocumentVersionSerializer(serializers.HyperlinkedModelSerializer):
         model = DocumentVersion
         read_only_fields = ('document', 'file')
 
-    def update(self, instance, validated_data):
-        try:
-            super(DocumentVersionSerializer, self).update(
-                instance, validated_data
-            )
-        except Exception as exception:
-            raise ValidationError(unicode(exception))
-
-        return instance
-
 
 class DocumentVersionRevertSerializer(DocumentVersionSerializer):
     class Meta(DocumentVersionSerializer.Meta):