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b. 90

composition: Op. 64 No 3, Waltz in A♭ major

..

In A Chopin overlooked the  lowering to b (the sign is present in As). A similar mistake was committed in GE1Ab too. 

category imprint: Interpretations within context; Differences between sources

issues: Errors in GE , GE revisions , Omission of current key accidentals , Authentic corrections of FE , Inaccuracies in A

b. 91

composition: Op. 64 No 3, Waltz in A♭ major

..

In A there is no cautionary  before a. In this context, it must be considered an oversight, particularly taking into account the fact that the sign was written in As. A natural was added in the proofreading of FE (→GE,EE).

category imprint: Differences between sources

issues: Cautionary accidentals , Authentic corrections of FE

b. 93-98

composition: Op. 64 No 3, Waltz in A♭ major

..

The notation of the accidentals in this fragment of A is inaccurate – there is not any flat lowering e2(1) to e2(1) in bars 94, 96 and 98. It is probably an echo of the draft notation of As, which is not only devoid of flats, but it includes naturals before e1 in bars 93 and 97. The signs were added in FE (→GE,EE).

category imprint: Interpretations within context; Differences between sources

issues: Cautionary accidentals , Omission of current key accidentals , Errors of A , Authentic corrections of FE

b. 98

composition: Op. 64 No 3, Waltz in A♭ major

..

In the manuscripts there is no  lowering d2 to d2. The composer's patent oversight was corrected in FE (→GE,EE).

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , GE revisions , Omission of current key accidentals , Errors of A

b. 100

composition: Op. 64 No 3, Waltz in A♭ major

..

In A there are no accidentals in the part of the R.H. This patent in this context oversight was corrected in FE (→GE,EE).

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , Omission of current key accidentals , Authentic corrections of FE , Inaccuracies in A