Sohoa was a procedurally-generated system on the FE2/FFE map, not an actual in-real-life star. A lot of the procedurally-generated systems from FE2/FFE that had bright stars and were too close to Sol have had to be eliminated from the ED map, because if they were added to the map there'd be a bright new star in the sky of Earth that shouldn't be there.
Going through the FE2 Gazetteer and searching for the stars listed in that book, we find a few other Lore systems missing:
Enaness, the famous Independent Communist system not far from Lave which got a mention on one of the Frontier short stories.
Extila, one of the most abundant agricultural planets in the Empire.
Liaququ, source of many famous pharmaceuticals extracted from the local starfish-like lifeforms.
Quphieth, a feudal system famed for being the native planet of the "planimals" such as the whispering palms featured in one of the Frontier short stories.
Another side effect is the Quince anomaly: Quince used to be a core Imperial system, but it orbits a red giant that I assumed would have been readily visible from Earth. Rather than omitting it entirely, they dumped it far, far away, so you can't actually see the star from Earth anymore, turning Quince into the remote outpost of the Empire we all know and love today.