Hi there,   This is an example code. I have a xlsx file with multiple sheets. One sheet name its given to me (dsname) and i would like to control if its correct or not. If it is, do a set. I use a macro because its a recursive action.     %let dsname=AE; /*Given to me*/ %macro doASet(name); libname test xlsx "C:\nameOfFile"; %if %sysfunc(exist(test.&name.)) %then %do; data out; set test."&name"n; /*for example*/ a = 8; run; %end; %else %put ---Data set &name does not exist.; %mend doASet; %opends(dsname); If the sheet exist, i do a data set and its all correct but if the sheet doesn't i wish to display and error like that or do another thing, but actually exist funct return 1. Always return 1!   I tried tones of combinations and I don't find the solution.  I thank you in advance for your help. Regards   ... View more