Duplicate invoice generated at the same time

[Julia Nunes]

We identified a case where Killbill generated two invoices for the same account and same target date.
Both invoices have status = COMMITTED and were created at the exact same timestamp, but with different created_by values. This suggests that two different processes might have triggered invoice generation simultaneously.

Example:

• Account: 00058ba4-b7ff-457c-9347-53335c1bae62

• Target Date / Invoice Date: 2025-08-30

• Invoices generated:

"id" : "33494534-876e-4a8d-a57e-c92e0e2f3a5e", "created_by" : "Next Billing Date", "created_date" : "2025-08-31T01:35:28.000Z"

"id" : "a12ce4e7-e440-41aa-bcf1-26ae671a413b", "created_by" : "SubscriptionBaseTransition", "created_date" : "2025-08-31T01:35:28.000Z"

Impact:

• Duplicate invoices created for the same account and date.

• Double charging the customer.

Question to the Killbill team:

• What is the recommended way to handle this case ?

• How can we prevent this duplication from happening again ?

[karan bansal]

Hi Julia,

Could you please query both the above invoices with this endpoint and share the results. It would also be helpful if you can list down the steps to reproduce this issue as well as sample catalog used. Please also share Kill Bill logs if possible.  

Regards

Karan

[Julia Nunes]

  Please find attached the query result with the duplicated invoices

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[karan bansal]

Hi Julia,

Could you please share the data that I have originally requested. I need to see the invoice items. It would also be helpful if you can share the other data as well like the steps to reproduce this issue and sample catalog used. 

Regards

Karan