DDP invoice and VAT

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Hi, 

I have received an invoice from a company based in Germany on Incoterm DDP (delivery duty paid). The invoice shows the 20% VAT element on the items and VAT has been included in the money paid. 

My problem comes in entering this invoice. 

The supplier is German, with a UK branch website, where the products were ordered.

Their invoice shows a DE and UK EORI number and a UK VAT number - no German VAT number to add to their account detail.

I can't add their EORI number as it's not long enough (Sage wants DE + 9 digits but it only has 7 digits). I can't add the UK VAT number as Sage automatically prefixes it DE - but I think that would be incorrect anyway? 

What's the best way to deal with entering the invoice? Should I omit the VAT altogether for the invoice and add it as an adjustment on the return? Or will this screw things up in the long run because I don't have the correct registration numbers on the transaction? 

Thanks!
Annie