Impossible to load gas

Hi Two Opel, a vectra of · 89 and a combo of · 04.amos have additionally installed the food kit with GLP gas. The Boquerel to replace is from Italian system so I need an adapter to replace in Spain. It passes and with adapters of the gas station itself, which is supposed to be standard.
Ask in several workshops, everyone tried to sell me a new anchovy and adapter, saying that the Boquerel is wrong. But that does not convince me, because if it were true I would give me problems and in other countries where the same system of anchovies and the guns of suppliers are used are used for that system.
Well, if Algien has an idea what happens or can tell me where you can inform me how to solve that problem would be grateful.

Thank you.