I want to configure equipment number range in such a wat that user can create equipment number like AA-500-123, AA-500-234, AA-500-345, AA-500-678
I want Special characters '-' as well. I created external number range as AA-000-000 to AA-999-999.
But I can see user can create equipment number MY-00A-34B, I am not getting why it is so.
Can someone help me on this.?