# GoCardless instalment_schedules create_with_dates: 'Invalid document structure' , amount vs total_amount
## What's going on
Creating an instalment schedule with `create_with_dates` failed with 'Invalid document structure' even when copying the docs' example params. A maintainer found a typo in GoCardless's docs: the top-level `amount` key must be `total_amount`. GoCardless corrected the documentation after the maintainer identified the typo.
## The verified fix
The docs example was wrong. Use `total_amount` (not `amount`) as the top-level key in `instalment_schedules.create_with_dates` , e.g. `total_amount: 10_000` for 100 GBP , and the 'Invalid document structure' error goes away. The maintainer fixed the documentation typo the same day. Source: https://github.com/gocardless/gocardless-pro-ruby/issues/83
## How to use this
Take the question above and check if it matches what you're seeing. If it does, work through the verified fix step by step. Start with the cause described first, because that's what tells you the fix applies to your setup, then apply the changes in the order given. Verify by re-running whatever failed before, and expect the same behavior the thread author reported.