Forse ti sbagli. Se usi le lettere la classe koma agginunge il prefisso cioè la parola capitolo o appendice, non il punto
Forse ho capito male io ma a pag. 57 della doc inglese c’è scritto:
pointednumbers
pointlessnumbers
According to DUDEN, the numbering of sectional units should have no
point at the end if only arabic numbers are used (see [DUD96, R 3]).
On the other hand, if roman numerals or letters are used, then a point
should appear at the end of the numbering (see [DUD96, R 4]). KOMAScript
has an internal mechanisms that tries to implement these rules. The
resulting effect is that, normally, after the sectional commands \part and
\appendix a switch is made to numbering with a point at the end. The
information is saved in the aux file and takes effect on the next LATEX run.
In some cases the mechanism that switches the end point may fail or
other languagues may have different rules. Therefore it is possible to
activate the use of the end point with the option pointednumbers or
to deactivate it with pointlessnumbers.
Please note that the mechanism only takes effect on the next LATEX
run. When trying to use these options to control the numbering format,
a run without changing any options should be made.
Calling these options dottednumbers and dotlessnumbers or similar
would be more correct. It so happened that the meaning of the chosen
names was not clear to me a few years ago when the options were implemented.