Activate the Debit Note module
Follow steps below:
In Zoho Books > settings > setup & configurations > general
Turn on the Debit Note module

Save the settings
Attempt to re-push the document.
Should this not work, you may be required to edit the document, and save it again to refresh the settings in the document as well.
Example below :
Edit invoice:
Save invoice:

You may then try to push the invoice as normal.
Please do not hesitate to contact us if you have any questions or require any assistance.