Some RPCs are not accessible internally

I'm trying to call RPCs within a java class and I got errors reporting that RPCs are not registered. However, these inaccessible RPCs are part of a pack of 6 which are all registered in the same place and, at least, one of them is accessible.

I attached a karaf.log to illustrate my purpose. Code is available here https://git.opendaylight.org/gerrit/c/bgpcep/+/97076 and more precisely in https://git.opendaylight.org/gerrit/c/bgpcep/+/97076/6/pcep/server/server-provider/src/main/java/org/opendaylight/bgpcep/pcep/server/provider/ManagedTePath.java line 274 for addPath which is OK, line 370 for updatePath which failed and 403 for removePath which failed too.

Not that all of these RPCs are working pretty well through RESTCONF using rest API interface.