You can trade a resource before researching it, but it doesn't show on the top

[WhoIsJohannes]

See title. I traded oil before researching Biology, I can use the oil to build planes, but I can't see on the top that I have it.

[SomeTroglodyte]

Well, this merits either an answer like

• Look for RejectionReasonType.ConsumesResources, dig down, the decisions are made in updateCivResources, no tech-check, dig further, tile.providesResources - aha there it is. Profiting from the improvement requires the tech, not the resource itself. So - by design? Check original game? And whether the WorldScreenTopBar should show what's not your own income - matter of taste?
• OR "hey, be glad your clothing is stain-free, and exploit quietly" or "I thought planes are mostly built from metals?" or "sound career decision, from high-pay high-risk semi-legal to a low-pay stable job in academia..."

[yairm210]

You should be able to trade for a resource before you have the tech to make it yourself.
Is that the situation?
Or did you manage to trade it away? Because that's a bug

[WhoIsJohannes]

No, I got it, it's all fine. This is only a UI problem. The top bar does not show this resource. Does it add other such traded resources to the count if you already have discovered the resource? I believe so, correct?

[yairm210]

Yes
I see your point - if you traded for a resource before you yourself have revealed it, it should indeed be shown on top bar