Hi. I've created a homebrew item (a set of scale mail armour) and have an issue I can't seem to solve.

As part of the description text I've added in my own wording, however I cannot get rid of this text from the final item - "This armor is made of narrow vertical strips of metal riveted to a backing of leather that is worn over cloth padding. Flexible chain mail protects the joints. "

Does anyone know where this is coded to appear and how I can remove it?

It is not possible to remove that text, it’s hard coded into the base equipment itself and we cannot access that.