diff --git a/examples/models/router/relations/basic.cfg b/examples/models/router/relations/basic.cfg
index 526761ea..a8241929 100644
--- a/examples/models/router/relations/basic.cfg
+++ b/examples/models/router/relations/basic.cfg
@@ -12,10 +12,14 @@ relations:
       requires:
         - no-ssh-sockets
 
+    interfaces:
+      requires:
+        - addresses
+        - routes
+
     # State
     $:
-      consists:
+      requires:
         - routes
-        - interfaces
         - addresses
         - ssh-sockets
diff --git a/libsysinspect/src/intp/inspector.rs b/libsysinspect/src/intp/inspector.rs
index f94a6f25..8b02d599 100644
--- a/libsysinspect/src/intp/inspector.rs
+++ b/libsysinspect/src/intp/inspector.rs
@@ -18,7 +18,7 @@ use crate::{
 };
 use colored::Colorize;
 use serde_yaml::Value;
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 
 pub struct SysInspector {
     entities: HashMap<String, Entity>,
@@ -126,12 +126,20 @@ impl SysInspector {
         let mut out: Vec<Action> = Vec::default();
         for s in &self.checkbook {
             if rids.contains(&s.id()) {
-                for rel in s.relations() {
-                    out.extend(self.actions_by_entities(rel.get_entities(state.to_owned()), state.to_owned())?);
+                for r in s.relations() {
+                    out.extend(self.actions_by_entities(r.required(&parse_state(state.clone()))?, state.clone())?);
                 }
             }
         }
 
+        if out.is_empty() {
+            return Err(SysinspectError::ModelDSLError(format!(
+                "Checkbook contains no such relations as \"{}\" that would be aligned with the state \"{}\"",
+                rids.join(", "),
+                parse_state(state)
+            )));
+        }
+
         Ok(out)
     }
 
@@ -139,6 +147,8 @@ impl SysInspector {
     pub fn actions_by_entities(&self, eids: Vec<String>, state: Option<String>) -> Result<Vec<Action>, SysinspectError> {
         let mut out: Vec<Action> = Vec::default();
         let state = parse_state(state);
+        let mut dropped: HashSet<String> = HashSet::default();
+        dropped.extend(eids.clone());
 
         for eid in eids {
             for action in self.actions.values() {
@@ -149,10 +159,19 @@ impl SysInspector {
                     // it also corresponds to other claims and conditions, and that then
                     // needs to be passed to the reactor.
                     out.push(action.to_owned().setup(self, &eid, state.to_owned())?);
+                    dropped.remove(&eid);
                 }
             }
         }
 
+        if !dropped.is_empty() {
+            return Err(SysinspectError::ModelDSLError(format!(
+                "Entities \"{}\" are not bound with the state \"{}\" or don't exist",
+                dropped.iter().map(|s| s.to_string()).collect::<Vec<String>>().join(", "),
+                state
+            )));
+        }
+
         Ok(out)
     }
 
diff --git a/libsysinspect/src/intp/relations.rs b/libsysinspect/src/intp/relations.rs
index 4e2ba3ef..8443f351 100644
--- a/libsysinspect/src/intp/relations.rs
+++ b/libsysinspect/src/intp/relations.rs
@@ -39,15 +39,21 @@ impl Relation {
         &self.states
     }
 
-    /// Get related entities
-    pub fn get_entities(&self, state: Option<String>) -> Vec<String> {
-        let mut out: Vec<String> = Vec::default();
-        let state = state.unwrap_or_default();
-        for (st, ent) in self.states() {
-            if st.eq(&state) || st.eq("$") {
-                out.extend(ent.values().flat_map(|eids| eids.to_owned()).collect::<Vec<String>>());
+    /// Get required entities (consists of).
+    /// There is no clear distinction between "consists of" and "required".
+    pub fn required(&self, state: &str) -> Result<Vec<String>, SysinspectError> {
+        let mut out = Vec::default();
+        if let Some(set) = self.states().get(state) {
+            if let Some(required) = set.get("requires") {
+                out.extend(required.iter().map(|s| s.to_string()));
             }
+        } else {
+            return Err(SysinspectError::ModelDSLError(format!(
+                "No required entities has been found in the \"{}\" relation as the \"{state}\" state",
+                self.id()
+            )));
         }
-        out
+
+        Ok(out)
     }
 }
diff --git a/src/main.rs b/src/main.rs
index a72f4af0..c001a145 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ use libsysinspect::{
     inspector::SysInspectRunner,
     logger,
     reactor::handlers,
+    traits::get_minion_traits,
     SysinspectError,
 };
 use log::LevelFilter;
@@ -108,6 +109,7 @@ fn main() {
         sr.set_state(params.get_one::<String>("state").cloned());
         sr.set_entities(clidef::split_by(&params, "entities", None));
         sr.set_checkbook_labels(clidef::split_by(&params, "labels", None));
+        sr.set_traits(get_minion_traits(None));
         sr.start();
     }
 }