How does bluenrg-1 configure the multi-channel support notification feature under the same service。

[Jyan.1]

DK version：BlueNRG-1_2 DK 3.2.1

Project：ST\BlueNRG-1_2 DK 3.2.1\Project\BLE_Examples\BLE_Chat_Master_Slave

I tried to change the two channels in the routine to be writable and notifiable, but the serial port message showed that adding service failed.I found that if you include notifiable attributes in both channels, the addition of services will fail. How should I modify it?