Reverse Charged Tax Code - Tax Summary vs Tax Transactions Report

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I assume you enter “Cash” transactions via receipts/payment. Negative line items can be entered by users when

  • Entering a negative amount sales or purchase line item or
  • Entering a counter transaction ie a purchase line item on a sales document (or vis vera)

The above examples require the opposite sale / purchase assignment.
Lubos is in the process of enabling the user to specify what they actually require in each case. Hence the changes you have observed in sale / purchase but identical overall net tax liability. I believe a true solution is close now which covers invoices, receipts/payments and journal entries.

To answer your direct question, yes archived versions of the program are available. To use them you will need an archived version of your data file containing all the data you want and not converted by opening it with a later incompatible version see

For an overview of the changes and my understanding of the plans see

and