set APM variable from irule LB_SELECTED

yes Kevin. To workaround the lack of variable support in APM AAA Radius, I need to "jump" to an internal VS (radius) to perform the authentication. I suppose it doesn't know APM session context and thus I cannot set that variable in APM. I've tried to write to apm logs (local1.) from the irule.. unsuccessfuly. We have many radius servers and in the APM session logs, I only see the IP of the VS and I would need to add the "real" radius server...