Invoices or daily income

Hey, don't shoot me down if I'm wrong. But if you keep a journal where you enter your daily receipts, you can issue one invoice at the end of the month instead of creating one for each day.

The invoices that don't follow each other, is that because of the programme? Or what do you mean? Normally, your invoices should follow each other. To do this, your invoices don't always have to start at 1, but can be randomised to other numbers.You can create invoices here, but you don't have to send them (yet); you can indicate manually that they have been sent/paid.

The situation is as follows: since I work in a practice, the invoices are automatically generated by the programme we use there, whereby three colleagues and I use the same invoice numbering. This means that there are gaps in my own invoices, as my colleagues use the other numbers.

Is it not possible to work with historical invoices?

That is certainly possible, but since the invoice numbering is already done automatically and is therefore not chronologically sequential, I don't think this is correct accounting practice. I acknowledged that invoices entered into the accounts must always be sequential.

For historical invoices, you have to enter the numbers manually.
So if your invoices are 2022-001 2022-002, and you have the invoices from the physiotherapy practice that you want to add to Dexxter, you will need to perform a manual adjustment of the numbering. Make a note in the notes that it is an invoice from the physiotherapy practice. Then write the Dexxter number on the original.
You can always give it a try. You still have to enter manually whether it has been sent/paid.

Do you mean that I should manually change the invoice number in my already sent invoices via the practice and then enter it in Dexxter as a historical invoice? The practice's invoice number is already stated on the document that is sent to patients.

Yes, that's what I mean.