'Ghost field in Odoo?

I have a field on a folio custom addon which is called "Discount". When I hover the mouse on the field it says me the type and the object but when I go at that object I can't find it. Also when editing the xml file from my IDE it won't update no matter how many rests and upgrades I will make to it. When I edit it from interactive debug it works(i.e. I can make it disappear by commenting the line and appear again by un-commenting). Can someone tell me what's the cause?

This is the code where the field points to: link1 link2 xml

Image here.



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