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When a TITLE statement includes a null character string and formatting options, such as HEIGHT or FONT, the following WARNING will appear in the SAS log:
WARNING: The TITLE statement is ambiguous due to invalid options or
The following TITLE statement replicates this behavior:
title height=8pt '';
Without the formatting options, the WARNING is not generated. In either case, the TITLE text appears as a single quote in the output. The work-around is to add a blank space between the single quotes.