Kia ora koutou, I'm new to vSPD and haven't used GAMS since the 90s but have been impressed with what I have seen so far workign with vSPD and GAMS in the last couple of months. I'm wondering if there is an example of the format for demand override GDX file? We exported i_tradePeriodNodeDemand into Excel, removed the columns for the nodes we weren't changing, changed the values for the nodes we were changing and then imported this data as ovrd_tradePeriodNodeDemand into a new GDX file. We pointed to this using but are getting errors:

Symbol not in GDX

I think I'm misunderstanding how to specify overrides so any help is very welcome. Nga mihi nui in advance for any help! Noho ora mai, Mike