diff --git a/deployment/v2_0_0/changesets/build_lanes_cross_family.go b/deployment/v2_0_0/changesets/build_lanes_cross_family.go
index 03f7bd0ee..10f55f82b 100644
--- a/deployment/v2_0_0/changesets/build_lanes_cross_family.go
+++ b/deployment/v2_0_0/changesets/build_lanes_cross_family.go
@@ -61,6 +61,28 @@ type ConfigureChainsForLanesFromTopologyConfig struct {
 	BuildLanesCrossFamilyConfig
 }
 
+// committeeQualifiersForLaneLeg returns the committee qualifiers that apply to the leg
+// from local → remote. A committee applies only if both the local and remote chain
+// selectors appear in its ChainConfigs — meaning the committee is configured for both
+// sides of the lane. When committees is nil, the single default qualifier is returned.
+func committeeQualifiersForLaneLeg(local, remote uint64, committees map[string]offchain.CommitteeConfig) ([]string, error) {
+	if committees == nil {
+		return []string{defaultQualifier}, nil
+	}
+	localKey := strconv.FormatUint(local, 10)
+	remoteKey := strconv.FormatUint(remote, 10)
+	qualifiers := make([]string, 0, len(committees))
+	for q, committee := range committees {
+		_, hasLocal := committee.ChainConfigs[localKey]
+		_, hasRemote := committee.ChainConfigs[remoteKey]
+		if hasLocal && hasRemote {
+			qualifiers = append(qualifiers, q)
+		}
+	}
+	sort.Strings(qualifiers)
+	return qualifiers, nil
+}
+
 // expandLanesToPartialChainConfigs converts bidirectional lane pairs into the internal
 // chain-centric representation used by the changeset apply path.
 func expandLanesToPartialChainConfigs(lanes []CrossFamilyLanePair, committees map[string]offchain.CommitteeConfig) ([]partialChainConfig, error) {
@@ -77,35 +99,14 @@ func expandLanesToPartialChainConfigs(lanes []CrossFamilyLanePair, committees ma
 			return nil, fmt.Errorf("lane %d: chainA and chainB must differ", i)
 		}
 		var qualifiers []string
-		remoteKey := strconv.FormatUint(lane.ChainB, 10)
-		for _, cvCfg := range committees {
-			if _, exists := cvCfg.ChainConfigs[remoteKey]; exists {
-				qualifiers = append(qualifiers, cvCfg.Qualifier)
-			}
-		}
-		sort.Strings(qualifiers)
-		if len(qualifiers) == 0 {
-			if len(committees) == 0 {
-				qualifiers = []string{defaultQualifier}
-			} else {
-				return nil, fmt.Errorf("lane %d: no committees have chain_config for remote chain %d", i, lane.ChainB)
-			}
+		qualifiers, err := committeeQualifiersForLaneLeg(lane.ChainA, lane.ChainB, committees)
+		if err != nil {
+			return nil, fmt.Errorf("lane %d: %w", i, err)
 		}
 		mergeLaneLeg(byChain, lane.ChainA, lane.ChainB, qualifiers, lane.ChainAOverrides)
-		qualifiers = nil
-		remoteKey = strconv.FormatUint(lane.ChainA, 10)
-		for _, cvCfg := range committees {
-			if _, exists := cvCfg.ChainConfigs[remoteKey]; exists {
-				qualifiers = append(qualifiers, cvCfg.Qualifier)
-			}
-		}
-		sort.Strings(qualifiers)
-		if len(qualifiers) == 0 {
-			if len(committees) == 0 {
-				qualifiers = []string{defaultQualifier}
-			} else {
-				return nil, fmt.Errorf("lane %d: no committees have chain_config for remote chain %d", i, lane.ChainA)
-			}
+		qualifiers, err = committeeQualifiersForLaneLeg(lane.ChainB, lane.ChainA, committees)
+		if err != nil {
+			return nil, fmt.Errorf("lane %d: %w", i, err)
 		}
 		mergeLaneLeg(byChain, lane.ChainB, lane.ChainA, qualifiers, lane.ChainBOverrides)
 	}
diff --git a/deployment/v2_0_0/changesets/build_lanes_cross_family_internal_test.go b/deployment/v2_0_0/changesets/build_lanes_cross_family_internal_test.go
index 50286503c..bb7620554 100644
--- a/deployment/v2_0_0/changesets/build_lanes_cross_family_internal_test.go
+++ b/deployment/v2_0_0/changesets/build_lanes_cross_family_internal_test.go
@@ -128,11 +128,12 @@ func TestExpandLanesToPartialChainConfigs_MultipleCommittees(t *testing.T) {
 	assert.Contains(t, cfgB.CommitteeVerifiers[1].RemoteChains, chainA)
 }
 
-func TestExpandLanesToPartialChainConfigs_FiltersCommitteeQualifiersPerRemoteChain(t *testing.T) {
+func TestExpandLanesToPartialChainConfigs_FiltersCommitteeQualifiersPerLaneLeg(t *testing.T) {
 	chainA := uint64(100)
 	chainB := uint64(200)
 
 	// alpha is on both chains; beta only on chainA; gamma only on chainB.
+	// Only alpha covers both sides of the lane, so it is the only qualifier for either leg.
 	committees := map[string]offchain.CommitteeConfig{
 		"alpha": {
 			Qualifier: "alpha",
@@ -165,21 +166,17 @@ func TestExpandLanesToPartialChainConfigs_FiltersCommitteeQualifiersPerRemoteCha
 		bySel[c.ChainSelector] = c
 	}
 
+	// beta (chainA only) and gamma (chainB only) are excluded from both legs;
+	// only alpha spans both chains.
 	cfgA := bySel[chainA]
-	require.Len(t, cfgA.CommitteeVerifiers, 2)
+	require.Len(t, cfgA.CommitteeVerifiers, 1)
 	assert.Equal(t, "alpha", cfgA.CommitteeVerifiers[0].CommitteeQualifier)
-	assert.Equal(t, "gamma", cfgA.CommitteeVerifiers[1].CommitteeQualifier)
-	for _, cv := range cfgA.CommitteeVerifiers {
-		assert.Contains(t, cv.RemoteChains, chainB)
-	}
+	assert.Contains(t, cfgA.CommitteeVerifiers[0].RemoteChains, chainB)
 
 	cfgB := bySel[chainB]
-	require.Len(t, cfgB.CommitteeVerifiers, 2)
+	require.Len(t, cfgB.CommitteeVerifiers, 1)
 	assert.Equal(t, "alpha", cfgB.CommitteeVerifiers[0].CommitteeQualifier)
-	assert.Equal(t, "beta", cfgB.CommitteeVerifiers[1].CommitteeQualifier)
-	for _, cv := range cfgB.CommitteeVerifiers {
-		assert.Contains(t, cv.RemoteChains, chainA)
-	}
+	assert.Contains(t, cfgB.CommitteeVerifiers[0].RemoteChains, chainA)
 }
 
 func TestExpandLanesToPartialChainConfigs_ChainOverridesCommitteeVerifierFinalityConfig(t *testing.T) {
@@ -224,12 +221,12 @@ func TestExpandLanesToPartialChainConfigs_ChainOverridesCommitteeVerifierFinalit
 			cfg = c
 		}
 	}
-	require.Len(t, cfg.CommitteeVerifiers, 2)
+	// Only alpha covers both chainA and chainB; beta/gamma are single-chain.
+	require.Len(t, cfg.CommitteeVerifiers, 1)
 	for _, cv := range cfg.CommitteeVerifiers {
 		require.NotNil(t, cv.AllowedFinalityConfig)
 		require.Equal(t, *finalityCfg, *cv.AllowedFinalityConfig)
 		require.Contains(t, cv.RemoteChains, chainB)
-
 	}
 }