The detailed setup of the spell by Yuuno is first seen in Nanoha (ep.4), but he mentions it is same as the "space" where he and Nanoha meet each other for the first time, indicating it is first cast in Nanoha (ep.1). In The MOVIE 1st, Yuuno also casts a force field, probably the same spell, when the Jewel Seed monster looks for him at the Makihara Animal Hospital. Presumably, the Wide Area Force Field (広域結界 Kōiki Kekkai) cast by Yuuno in subsequent episodes and A's manga is referring to the same spell.