V2min set to 145

[FSM]

I'm trying to set up the SIM to mimic a BA profile that uses V2 at 143kts. I can't seem to set it below 145kts however with a v2min message beside the box. Am I missing something obvious or can I override the protection? Thanks

https://photos.app.goo.gl/XfMuYD1fH85BJTNs5

[Hardy Heinlin]

If you reduce the gross weight in your FMC to 215 tons, V2min will decrease to 142 kt.