The 
marking represents an earlier, less developed dynamic concept – the next indication in FCI would be the whole-bar 
mark over the R.H. part in b. 32, in the final version replaced with a long accent in the middle of that bar. In A, in the discussed bars, Chopin initially wrote other markings too – two more or less whole-bar marks.
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations; Source & stylistic information
issues: Corrections in A, Deletions in A
notation: Verbal indications