update the updateddateutc when an invoice is modified
I noticed that the value UpdatedDateUTC for an invoice is never reset once it is put into Xero no matter what modification I did to an invoice such as add/delete a line item or add a reference at Xero. Thus the updated invoices can not be retrieved even though they did update after modifiedSince
We added the updated timestamp primarily to see payments added to invoices. We have no way of getting the info you need at the moment. If you’re keen to see this implemented soon please vote for it
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David Husselmann commented
Our situation is a process of synchronising invoices in Xero with our system. Unfortunately having no timestamp doesn't work well for this as we have to export all invoices since the beginning of time. Would be really good to have UpdatedDateUTC really mean what it implies.