Cars Shown In Work Order Don't Show Up in Sim, .act file only shows UID and siding number, not info on car Options

[Conductor Chris]

I've been modifying the Buffalo template, adding a larger variety of rolling stock and changing things up.

After adding cars to the template .act file and making new SLGTBD and SLGACT files I got everything working, I thought. I generated an activity which produced a credible looking work order and a SLG prefixed activity file to use which I then loaded up in Open Rails. I eased the locomotive out of the engine house and got a surprise when I found the yard bare.

A little investigation shows that the .act file that was produced by activity generator shows only UID and siding number for the cars instead of the car folder name and file name.

In other words, it looks like this:
Events (
EventCategoryAction (
EventTypePickUpWagons ( )
ID ( 1 )
Activation_Level ( 1 )
Outcomes ( )
Name ( "Action 1")
Wagon_List (
UiD ( 2184839168 )
SidingItem ( 3827 )
UiD ( 2184839169 )
SidingItem ( 3827 )
UiD ( 2184839170 )
SidingItem ( 3827 )

Any idea why this might have happened?

Obviously Activity Generator is able to read the cars it has to work with, as it produced the switch lists, but it wasn't able to property write them to the new .act file. Why?

Thank you
Christopher