The code incorrectly generates a macro variable called BB with a value of _aa=100.

To circumvent the problem, do one of the following:

1. Use the %UNQUOTE macro function. For example:
   %macro abc(value); %let i=%length(&value); %substr(&value,1,&i) %mend; %let a=bb; %let %unquote(%abc(&a)_aa)=100; %put _user_;
2. Place the %LET statements within a macro definition. For example:
   %macro abc(value); %let i=%length(&value); %substr(&value,1,&i) %mend; %macro test; %let a=bb; %let %abc(&a)_aa=100; %put _user_; %mend test; %test
3. Remove the macro call from the expression. For example:
   %macro abc(value); %let i=%length(&value); %substr(&value,1,&i) %mend; %let a=bb; %let temp=%abc(&a); %let &temp._aa=100; %put _user_;

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