thanks for suggesting, in my previous maps I have done the same thing, but the problem is, if players have more mods for productions other than what i have, then those products can’t be sold in my map, hence to support those I made my selling points to accept standard types, that’s why gas station accepts production types of all kind, least thing player can do now is check name of selling station of you think it’s not valid to sell there, better to sell at other place by skipping this one