Hello @Quodly,
I get the same error message (in English, though): ERROR: Invalid member name for file WORK.CON.DATA.
In various places of the SAS(R) 9.4 Companion for Windows you find a sentence like "The words AUX, CON, NUL, PRN, LPT1 - LPT9, and COM1 - COM9 are reserved words under Windows" followed by the instruction not to use any of these reserved words as
But, indeed, I haven't found the corresponding statement for dataset names. So, thanks for pointing that out.
Edit: Actually, "filenames" comes very close: Windows (7) wouldn't even allow you to name any file aux, con, nul, etc. Not surprisingly, .sas7bdat files, i.e. SAS datasets, aren't an exception.