This is usual because the gateway has been assigned to a Route patterns. Check your route patterns and see which one this gateway has already been assigned to. Remove the gateway and then you can add it to a route group
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"The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
aokanlawon is correct (+5), to quickly see which route patterns use this GW directly (not a good practice) you can use dependency records (upper right corner drop box) assuming you have dependency records enabled via enterprise parameters.
thank you so much all , i found the issue , the sub unit wasn't in a device pool , it eas in none device pool ,and when i change the device pool coinfiguration for this port , the decice appeared in the list
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.