ContributionsMost RecentMost LikesSolutionsRe: Handling deleted invoices Hi mbuckley0, Unfortunately, the best you can do is get the client(s) to enable the 'Transactions cannot be changed, must be reversed' setting in preferences. You can then test it from the Company -> Preferences endpoint, refuse to run the rest of your integration and wag your finger at the client file until they switch it back on. Guaranteed to make the clients pretty unhappy though. Nick Re: Error 173 - linking with simPro Exactly same issue with NETO/Maropost Cloud MYOB integration. Started on/around Monday 12th, same error.