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.Based on the conversation with Joh Kliewe, the requirement is put back to Submitted status
Thanks for submitting the RFE about enhancing DFSORT symbol processing. However the request is already delivered. Fixlen=N is an operand of the form KEYWORD=n and with z/OS 2.1 you can have the symbols for FIXLEN. The following operands of the form KEYWORD=n can now be specified as KEYWORD=symbol where symbol represents an equivalent number (for example, if you have New_Length,25 in SYMNAMES, you can use LENGTH=New_Length wherever you can use LENGTH=25): ABSPOS, ACCEPT, ADDPOS, AVGRLEN, DO, ENDPOS, ENDREC, FIXLEN, ID, IFOUTLEN, INCR, LENGTH, LINES, MAXLEN, RECORDS, REPEAT, SAMPLE, SEQ, SKIPREC, SPLIT1R, SPLITBY, START, STARTPOS, STARTREC, STOPAFT and SUBPOS.
In your example you are passing a symbol that is of the KEY=FIELD format. FIXLEN operand accepts numeric values. So in your case you need to specify
//SYMNAMES DD *
FIRST,10
LAST,30
//C001CNTL DD *
INREC PARSE=(%01=(ENDBEFR=C',',FIXLEN=LAST),
%02=(ENDBEFR=C',',FIXLEN=FIRST)),
BUILD=(%02,%01)
/*
And this will get translated to
OPTION COPY
INREC PARSE=(%01=(ENDBEFR=C',',FIXLEN=30),%02=(ENDBEFR=C',',FIXLEN=10)*
),BUILD=(%02,%01)
Let us know if you need more information.