I know that there is such a MERGENOBY option. Is there also something similar that would work something like SET NO BY but, for example, just in cases if you use FIRST.variable or LAST.variable? (Option that would not let you use first.variable if you don't use BY statement?)
Seems too complicated to really have such, but maybe you know some trick how not to forget BY statement in such cases
120 options dsoptions=note2err;
121 data test;
122 set sashelp.class;
123 if first.name then;
ERROR: Variable first.name is uninitialized.
NOTE: The SAS System stopped processing this step because of errors.
WARNING: The data set WORK.TEST may be incomplete. When this step was stopped there were 0
observations and 5 variables.
WARNING: Data set WORK.TEST was not replaced because this step was stopped