You can use the old version of the C/AL Editor by running the Microsoft Dynamics NAV Development Environment from a command prompt and setting the useoldeditor parameter.
01. Open command prompt
02. Set the path to your RTC folder and type below command
finsql.exe useoldeditor=yes
and there it goes..
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Thank you and Regards,
Tharanga Chandrasekara
Tharanga Chandrasekara