Yes,By assuming Keyword ALTSEQ(QSYS/QASCII) in LF can only solve the sort sequence problem,How to value the KEYID,I think Tom’s say is a right way.
So others about the sequence like these:
1: The table which you use is decided by your pratical applications.
This table QASCII is tranfer the EBCDIC code to ASCII code,because the char&numeric sort sequence is reversely,so the table QASCII was choosed.
2: If some of the keylist don’t want to change the sort sequnce, the keyword NOALTSEQ(a key field-level keyword) is assumed to the specific fields.