How would you know if your SAS program had any errors then? If you run your program in batch mode there is no limitation on log size and your program would probably run faster as well. ... View more

You are just making the code more confusing by placing macro definitions inside of each other.  There is just a single name space for macros.  But every macro does create its own name space (scope) for macro variables.  If you don't define a macro variable as LOCAL to the macro and there already exists a macro variable in an outer scope then it will be used.  So when control returns from macro three the value of I is now larger than the upper limit of the do loop in the macro one.   %MACRO My_Macro_3; %local i; %do i = 1 %to 47; ..... %end; %MEND My_Macro_3; %MACRO My_Macro_1; %local i; %do i = 1 %to 2; ... %My_Macro_2(&Para1.); ..... %My_Macro_3; %end; %MEND My_Macro_1; %My_Macro_1; ... View more