Hello Lynsey, 

You will need to create new invoices which you can recall. To do this you will need to create the invoice, then select the memorise option. At which point you can then recall it when you need to use it again in the future. This Guide explains how to set these up. 

If this has answered your question please click More > Verify Answer.

Regards, Sam

Thank you for using Sage City

I think you are referring to a purchase invoice or a batch sales invoice. I already use the memorise option, so that won't be a problem to edit.

There isn't an option when using the invoices or credits to raise invoices. Hence why we duplicate then edit. 

We're having this issue too and its a big pain. I don't understand why the check by the software to see if invoice items have different tax codes can't be done on the save invoice function, not against each individual item. That would stop this irritating issue. It happening a lot when you enter all the invoice information and forget that you need to reverse vat it and change the tax codes, or when you are using a quote to create an invoice.

I believe that they are looking at this and are going to amend it on version 2. Woop woop!

easiest way around, is to change all tax codes to T22 and then go back and change to T21, this is the way i have got around this issue as i also have multiple lines and fdo not want to re-enter manually.