Using a SAS function within %SYSFUNC, where part of the function name 
is a macro variable, may cause an error.
 
Here is an example:

  %let name=s;
  %put %sysfunc(ab&name(-1));

One possible error message from the above could be:

  ERROR: Expected open parenthesis after macro function name not found.

A possible work-around would be to place the entire function within a macro 
variable.

Here is an example:

  %let name=abs;
  %put %sysfunc(&name(-1));

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