What is Breve Judiciale Debet Sequi Suum Originale, Et Accessorium Suum Principale?

Legal Definition
Jenk. Cent 292. A judicial writ ought to follow its original, and an accessory Its principal.
-- Black's Law Dictionary
Legal Definition
A judicial writ ought to follow its original, and an accessory its principal.
-- Ballentine's Law Dictionary