[DaLump]

Is it possible to have an upgrade as a pre-requisite for a unit or structure?

[AntiSocialKindaGuy]

Could you just add the Upgrade = xxx under prerequisites? Although I assume you've already tried that.

[Retnuh]

Won´t be so easy.
I had same problem some time ago and only solution I found was
not to limit the UNIT itself but its BUTTON where you can have
upgrade as pre-requisite

CommandButton Command_Construct*YOURUNIT*
Command = UNIT_BUILD
Object = *YOURUNIT*
Options = NEED_UPGRADE
Upgrade = *YOURUPGRADE*
End

The only problem is that when you will hold mouse on it it won´t show you why you can´t buy it so you have to include it in DescriptLabel.

[CommieDog]

Or you can have an upgrade trigger the creation of an object that can act as a prerequisite.

[DaLump]

Sweet. That will do just fine. Thanks for your input.

[Waraddict]

Is there any possible way to make an object the prerequisite for an upgrade???

[sc4freak]

Put the upgrade on the object?

[Waraddict]

No that's different, Im talking about making an upgrade purchasable after building a certain object1

[mastermind2003]

Nope. Upgrades cannot have prerequisites.

[AntiSocialKindaGuy]

But surely the upgrade button can.