You cannot Delete a Route After they Have been Activated and the Visits Generated.
Reproducing the Issue
Go to Visits work center.
- Navigate to Routes View
Select and route and Click in Delete.
You will be not able to delete the route as the button is grayed out
This is standard behavior. The visit route deletion for the ones which visits have already been created is not supported.
KBA , SRD-CC , Cross Components , How To