Hi, 

Once the invoice is in the manual supplier invoice screen, we have no user provision to cancel a mass of invoices. Users may cancel one by one. 

In this forum, someplace, a question was asked many months ago, regarding a migration mistake where invoices were loaded incorrectly, and the wish was mass cancelation. 

One of the answers described a need for a custom script. 

If these invoices are in a non-production type environment, it may be quicker / easier to do a payment for all. 

If this is PROD, then it’s a bigger issue. 

Best regards, 

Thomas