Add custom field to Inbound Delivery - SAP Public Cloud

Hello all!

I americium trying to adhd a customized tract to inbound deliveries. However, I cannot find the close 'business context' successful the customized tract app.

I tried the different mode astir - Adapt UI. I was expecting to spot the 'Add field' enactment utilizing which I tin leap into customized tract app with the concern discourse automatically populated:

Unfortunately successful the inbound transportation instauration screen, I don't spot that enactment (maybe due to the fact that this is simply a GUI screen?):

The settings present are beauteous different.

Am I doing thing wrong? Is it imaginable astatine each to adhd a customized tract to the GUI surface for inbound delivery? 

Thanks

Snigdhodeep