+ return "Both srcsvc and src were defined; only one can be specified"
+ if $self->srcsvc && $self->src;
+
+ return "one of srcsvc or src is required"
+ unless $self->srcsvc || $self->src;
+
+ return "Unknown srcsvc: ". $self->srcsvc
+ unless ! $self->srcsvc || $self->srcsvc_acct;