Recode variables based on the specification in tbl_KodeBok ie. codebook.
LESID must be combined with FILGRUPPE to create a unique reference to
be able to recode the variables. Specification group ALLE will be
used when neither FILGRUPPE nor LESID is specified.
See also
Other recode functions:
do_recode_aggregate(),
do_recode_post(),
do_recode_regexp(),
get_codebok(),
get_codebok_aggregate(),
get_codebok_regexp()
