Illegal/not allowed characters in RT identifiers.

Hi Guys, 

   we have a legacy table whose primary key (column X) is getting generated by a dynamic string(alpha-numeric n special characters) of six characters. The DSE had been used in entity Back record .

    if the # is available in X column value , upon clicking record link it is throwing beside error. 

   what are the various special characters not supported in  record link identifier ? 

Thanks

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