---
title: "400 Bad Request"
description: "400 Bad Request"
keywords: "400 Bad Request"
url: "https://myrapidi.com/wiki/400_bad_request_odata"
locale: "en"
published: "2025-03-07T20:18:48Z"
modified: "2025-03-07T20:18:48Z"
---

This error generally occurs when there is an issue with the syntax of the request.  
  
Examples:  
  

- [ Application\_CallbackNotAllowed](https://wiki.myrapidi.com/wiki/application_callback_not_allowed)
- [ Internal\_InvalidTableRelation](https://wiki.myrapidi.com/wiki/internal_invalid_table_relation)
- [Internal\_EntityWithSameKeyExists](https://wiki.myrapidi.com/wiki/internal_entity_with_same_key_exists)
- [Phone No. must not contain letters](https://wiki.myrapidi.com/wiki/400_bad_request_phone_no_must_not_contain_letters)
- [Write validation failed for table row of type](https://wiki.myrapidi.com/wiki/write_validation_failed_for_table_row_of_type_custcustomerentity)