Eggie: I usually agree with your comments but this time I must beg to differ.
If someone who is owed money by someone else gets an embargo on the debtor's property, and the embargo does not follow the property, then think how unfair it would be to the creditor if the debtor were to simply sell or otherwise get rid of the embargoed property to render the embargo useless. Getting rid of it in the manner you suggest is punishable by law.
When a property is embargoed to cover a debt, this embargo always goes with the property. That is protection of the creditor's rights to collect. That is, I believe, the law in most countries and not only in Spain. What one needs to do when one buys property such as real estate, housing, vehicles, etc. (property most likely to be embargoed), is to check whether there are embargoes on that property and require the seller to lift any embargo before carrying out the purchase. In the case of vehicles, this is done though the Department of Motor Vehicles. This is specially relevant in those cases where the selling price of the vehicle looks like a fantastic bargain. It may mean the seller is trying to get rid of the embargo.