Why can’t I change the amounts on this supplier invoice?

You opened an already-received (booked) supplier invoice and tried to change its line items, for example an amount, a quantity or a VAT rate. The app refused, because as far as it knows the VAT period the invoice falls in has already been reported to FURS. This only happens when you edit line items on an already-received (booked) invoice, not on a draft: changing line items on a booked invoice reverses and reposts the original journal entry at its original date, which would silently change turnover already reported for that period.

This hits hardest at companies who are still migrating to us and entering last year’s supplier invoices: the periods those invoices fall in were often already filed by the previous accounting provider.

What the screen says

Popravek vključite v tekoči obračun prek »Popravi vstopni DDV« na tem računu; pri računih s samoobdavčitvijo tega dejanja ni, zato popravek knjižite z ročno temeljnico. Obdobje DDV tega računa je bilo FURS-u že poročano (oddan je bil obračun DDV-O, do 30. 6. 2026), zato njegovih zneskov tukaj ni mogoče spreminjati: s tem bi tiho popravili že oddani obračun. Pravna podlaga: ZDDV-1, 88.b člen.

In English: this invoice’s VAT period has already been reported to FURS (a DDV-O was submitted, through 30 June 2026), so its figures cannot be changed here, that would silently restate an already-filed return. Book the correction into the current return instead (ZDDV-1 88.b), using “Correct input VAT” on this invoice, or, on a reverse-charge invoice where that action is not offered, as a manual journal entry.

The part in parentheses names how the app knows the period was reported: either a DDV-O was filed for it inside this product, or KIR/KPR evidence was submitted, or a previous provider recorded it as already filed when you took the company over. In that last case the period comes from the VAT opening statement you (or whoever set up the tenant) recorded under Nastavitve → DDV → Prenos od prejšnjega izvajalca (Settings → VAT → Prior provider handover).

When the app genuinely doesn’t know whether the period was reported, it saves the change and shows a persistent warning alongside the usual success message:

Sprememba je shranjena. Če vnesete začetno stanje DDV (ali je prejšnji izvajalec oddajal in do katerega obdobja), bo to mogoče preveriti samodejno. Sprememba je posegla v obdobje DDV, za katero nimamo podatka, ali je bilo že oddano, bodisi z vaše strani bodisi s strani prejšnjega izvajalca; če je bilo, sodi popravek v tekoči obračun. Pravna podlaga: ZDDV-1, 88.b člen.

In English: the change was saved, but it touched a VAT period there is no record of, either filed by you or by a previous provider. If it was filed, the correction belongs in the current return instead (ZDDV-1 88.b). Recording the VAT opening statement (whether a previous provider filed, and through which period) will let this be checked automatically.

Why this happens

Once a DDV-O return has been filed for a period, the input VAT it declared must not be silently restated. ZDDV-1 čl. 88.b deliberately moves that kind of correction into the current, not-yet-filed return instead. For a company still entering past supplier invoices, this means: the moment a period is reported, mistakes on invoices already entered for it are no longer a matter of editing that invoice, they belong in the next DDV-O return.

What to do

1. Read the message for the period the VAT was already reported through (for example, through 30 June 2026), and on what basis.
2. Don’t try to fix the amounts on this invoice, that would silently change an already-filed return.
3. On the invoice, open the actions menu (the three dots, top right) and choose Popravi vstopni DDV (“Correct input VAT”).
4. In the dialog, pick what you are correcting (too much or too little VAT was deducted), enter the amount, the cost account and a reason, then confirm with Knjiži popravek (“Book correction”). The correction is booked into the current open period; the original posting is left unchanged and the amount owed to the supplier does not move.
5. After booking, the dialog reports the difference to enter into the input-VAT boxes of the current DDV-O return (ZDDV-1 čl. 88.b). The return is not corrected automatically — you or your accountant does that step.
6. If the mistake was in something that doesn’t affect VAT, for example a reference number or a note, you can still save that change. The unknown-filing-status warning may still appear, but it doesn’t block saving.

If you can’t fix this yourself