I have a query… If at the time of obtaining GST registration 3 types of SAC CODES are selected and now service is provided in one additional 4th SAC code, then is it mandatory to incorporate this SAC code in gst regn. And then raise necessary invoice…? Or without any change in GST registration, such invoice can be raised…?

I have a query… If at the time of obtaining GST registration 3 types of SAC CODES are selected and now service is provided in one additional 4th SAC code, then is it mandatory to incorporate this SAC code in gst regn. And then raise necessary invoice…? Or without any change in GST registration, such invoice can be raised…?