In bar 288, in the minim L.H. chord, Chopin repeated a 
to e1, perhaps confused by the difference in levels between this note and the e1 note in the 1st chord in the bar. The superfluous accidental was omitted in FE (→EE). Similarly, in bar 289 all sources feature a to a in the 1st quaver chord. In the same chord, however, the necessary raising e
to e is missing.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources; Editorial revisions
issues: Cautionary accidentals, Omission of current key accidentals, Inaccuracies in A, Errors repeated in GE, Errors repeated in FE, Errors repeated in EE
notation: Pitch