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b. 30

composition: Op. 12, Variations in B♭ major

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In the main text we add a cautionary  to e1 at the beginning of the bar.

category imprint: Editorial revisions

b. 31

composition: Op. 12, Variations in B♭ major

..

In FE (→GE1) the accidentals on the 4th beat are missing. The undoubtedly overlooked  restoring g2 was added in EE and GE2.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , Omissions to cancel alteration , GE revisions , Errors repeated in GE

b. 49

composition: Op. 12, Variations in B♭ major

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In FE the  raising e2 to e2 is missing. The patent mistake – e2 is featured in the opera's original theme – was corrected both in GE and EE.

category imprint: Interpretations within context; Differences between sources

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

b. 57

composition: Op. 12, Variations in B♭ major

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In the main text we add a cautionary  to a1, as it was also done in GE2.

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 72

composition: Op. 12, Variations in B♭ major

d3 in FE

b2 in GE & EE

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The version featuring b2 present in GE and EE was initially in FE as well, which is indicated by possible traces of corrections in print. It means that the change was performed in the last stage of proofreading – after the copies serving as the bases for GE and EE had been sent to the publishers in Leipzig and London. According to us, it is not the initial version but a Terzverschreibung mistake committed most probably by the engraver. 

category imprint: Differences between sources; Corrections & alterations

issues: Terzverschreibung error , Authentic corrections of FE