There are three sites A, B and C, the OTV link between site A and B is currently in operation, this works correctly, interface Overlay 1.
If you want to add site C, you already have a connection to sites A and B, when you configure OTV between site C and site B, it sends the following error inside the OTV:
SITIO_C # interface Overlay 3
SITIO_C (config-if) #service instance 10 ethernet
SITIO_C (config-if-srv) #encapsulation dot1q 10
!!!!!! Vlan-ids 10 already configured under other service intance
SITIO_C (config-if-srv) #
The Vlan was registered in the interface overlay 2 correctly, that it connected with site A. In the file is the diagram.