Insurance companies ,whether in Spain or any other country , work under eu rules & cannot reclaim iva/vat paid to the repairing garage . (They are vat /iva exempt. ) BUT if you , the claimant , are iva/vat registered they will ask (normally ) you to pay the iva/vat part of the claim as you can then reclaim it from the taxman. This cuts down on their outgoings & is perfectly legal.
I had this happen to me once in the UK .