Nested CASxx, DO, DOU, DOW, DOUxx, DOWxx, FOR,
IF, IFxx, MONITOR and SELECT statements is a key ingredient for making what’s known as "Spaghetti
code".
Such code is hard to read, refactor and therefore maintain.
Noncompliant Code Example
With the default threshold of 3:
IF A <> B
IF B <> C
DOW B <> A
IF A <> D
...
ENDIF
ENDDO
ENDIF
ENDIF
if a <> b;
if b <> c;
dow b <> a;
if a <> d;
...
endif;
enddo;
endif;
endif;
