In this blog, we will learn, step by step, how to account for imports with deferred VAT with in Odoo. To obtain a more immersive solution, you can review the explanatory video attached below.
First, the import invoice must be accounted for with its corresponding DUA, remembering that in versions 17 and 18 and later of Odoo, the program automatically deducts the base amount, leaving only the VAT to be paid, which is why we indicate the freight forwarder on the invoice.

Once the invoice is accounted for, we can move to our declaration of the model 303. Where we can see box 33 with the corresponding amount of VAT paid.
Also remember that box 77 for deferred VAT is completely editable, where we can add the amount from box 33. What this box allows us to do is alter the result of model 303 by indicating the amount of deferred VAT that we have not paid at customs.

Once we have verified model 303, we can confirm and create the entry, where we will see the previous amount, as it does not take into account the new total, so it will be necessary to manually modify the amount to match the new generated model, to indicate what we have actually paid. The difference generated from this modification should be transferred to account 472 of VAT paid because it is an amount that we cannot deduct, as we have not paid it.

Once the entry has been reviewed, it would simply need to be published and the model 303 submitted to the tax authority.