I'm translating a document template, to be filled out later for specific purposes. In one of the tables, the person who will fill out the document is instructed to either specify the pharmacopoeial monograph on which his analytical procedure is based or, if he created the analytical procedure all by himself, to just draw a horizontal line so that nobody could later manipulate the document by writing something there.
What do we call it in English when someone is instructed to draw a line in a form in order to indicate an absence?
(Provide a) Reference to the relevant EP, USP or BP monograph or other document. If the procedure was developed in-house without reliance on other documents, place a horizontal line. (?)
Or maybe it is "use a dash"?