Simple Fix for 400 Bad Request API Error (External Lookup)

Problem

While selecting data from an external lookup field, an error occurred.

  • API returned 400 (Bad Request)

Cause

The API URL was using an old version (v14.0), which is no longer supported.

Fix

Just remove the version from the API URL.

Before:

/attask/api/v14.0/...

After:

/attask/api/...

Result

  • The API will use the latest version automatically

  • Error gets resolved

Takeaway

If you see a 400 error, check if you're using an outdated API version.

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