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b. 44

composition: Op. 27 No 2, Nocturne in D♭ major

..

The sources have extra naturals before a1 on the 4th quaver and a, the 10th semiquaver of the left hand. This is probably the result of the changes made in A.

category imprint: Editorial revisions; Source & stylistic information

issues: Cautionary accidentals

b. 44

composition: Op. 27 No 2, Nocturne in D♭ major

..

In A the second part of the bar was initially notated without the enharmonic change to the sharp key.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A

b. 44

composition: Op. 27 No 2, Nocturne in D♭ major

..

The sources have additional naturals before a1on the 4. quaver of the bar and a, the 10the semiquaver of the left hand. This is probably the result of changes made in A.

category imprint: Editorial revisions; Source & stylistic information

issues: Cautionary accidentals

b. 44

composition: Op. 27 No 2, Nocturne in D♭ major

..

In the majority of sources there is no  raising f3 to f sharp3. The sharp was added only in GE2

For writing that note Chopin used 4 ledger lines (one too many). He corrected his mistake by deleting the lowest ledger line. Interestingly, it seems that the engraver of GE did not notice the correction, as that edition has got visible traces of moving the note head down by a third. 

category imprint: Differences between sources; Corrections & alterations

issues: Accidentals in different octaves , Terzverschreibung error , GE revisions , Errors in the number of ledger lines

b. 45

composition: Op. 27 No 2, Nocturne in D♭ major

..

A flat before g flat3 is written in A not before the head of the note but much lower. That type of peculiar notation is often encountered in Chopin's manuscripts. 

category imprint: Source & stylistic information

issues: Accidental below/above the note