Variable names in the form of _Cn_ are reserved in PROC REPORT.

In SAS® releases prior to SAS® 9.4, errors like the following might occur if the input data set to PROC REPORT contains variables that are named in the _Cn_ form:

ERROR:  Read Access Violation In Task [ REPORT ]
Exception occurred at (0817F02E)
Task Traceback
Address   Frame     (DBGHELP API Version 4.0 rev 5)
...

Beginning with SAS 9.4, the "Read Access Violation" error no longer occurs. The following error might be generated instead:

ERROR: The name _c2_ is reserved for use in COMPUTE blocks. Try using an alias on this column.

To circumvent the problem, do one of the following:

• Rename the variables in the input data set.
• Assign an alias for each variable in the COLUMN statement. For example:

  column _c2_=x2 _c3_=x3 _c4_=x4; 
  

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