diff --git a/source/engine/rules.js b/source/engine/rules.js
index 9d9491119..82b0215e0 100644
--- a/source/engine/rules.js
+++ b/source/engine/rules.js
@@ -52,7 +52,12 @@ export let enrichRule = (rule, sharedData = {}) => {
 			subquestion = subquestionMarkdown && marked(subquestionMarkdown),
 			defaultValue = rule['par défaut'],
 			examples = rule['exemples'],
-			icon = rule['icônes']
+			icon = rule['icônes'],
+			justNamespace =
+				!rule.formule &&
+				!rule.question &&
+				!rule['non applicable si'] &&
+				!rule['applicable si']
 
 		return {
 			...rule,
@@ -66,7 +71,8 @@ export let enrichRule = (rule, sharedData = {}) => {
 			defaultValue,
 			raw: rule,
 			examples,
-			icon
+			icon,
+			justNamespace
 		}
 	} catch (e) {
 		throw new Error('Problem enriching ' + JSON.stringify(rule))
@@ -105,17 +111,24 @@ export let encodeRuleName = name =>
 export let decodeRuleName = name =>
 	name.replace(/--/g, ' . ').replace(/-/g, ' ')
 
+export let ruleParents = dottedName => {
+	let fragments = splitName(dottedName) // dottedName ex. [CDD . événements . rupture]
+	return range(1, fragments.length)
+		.map(nbEl => take(nbEl)(fragments))
+		.reverse() //  -> [ [CDD . événements . rupture], [CDD . événements], [CDD] ]
+}
 /* Les variables peuvent être exprimées dans la formule d'une règle relativement à son propre espace de nom, pour une plus grande lisibilité. Cette fonction résoud cette ambiguité.
  */
 export let disambiguateRuleReference = (
 	allRules,
-	{ ns, name },
+	{ dottedName, name },
 	partialName
 ) => {
-	let fragments = ns ? [...ns.split(' . '), name] : [], // ex. [CDD . événements . rupture]
-		pathPossibilities = range(0, fragments.length + 1) // -> [ [CDD . événements . rupture], [CDD . événements], [CDD] ]
-			.map(nbEl => take(nbEl)(fragments))
-			.reverse(),
+	let pathPossibilities = [
+			[], // the top level namespace
+			...ruleParents(dottedName), // the parents namespace
+			splitName(dottedName) // the rule's own namespace
+		],
 		found = reduce(
 			(res, path) =>
 				when(is(Object), reduced)(
diff --git a/test/rules.test.js b/test/rules.test.js
index 8f840e088..d7a49621f 100644
--- a/test/rules.test.js
+++ b/test/rules.test.js
@@ -2,6 +2,8 @@ import { map } from 'ramda'
 import { expect } from 'chai'
 import {
 	rules,
+	disambiguateRuleReference,
+	ruleParents,
 	enrichRule,
 	translateAll,
 	nestedSituationToPathMap
@@ -132,4 +134,53 @@ describe('misc', function() {
 			'2300'
 		)
 	})
+	it('should procude an array of the parents of a rule', function() {
+		let rawRules = [
+			{ nom: 'CDD', question: 'CDD ?' },
+			{ nom: 'taxe', formule: 'montant annuel / 12', espace: 'CDD' },
+			{
+				nom: 'montant annuel',
+				formule: '20 - exonération annuelle',
+				espace: 'CDD . taxe'
+			},
+			{
+				nom: 'exonération annuelle',
+				formule: 20,
+				espace: 'CDD . taxe . montant annuel'
+			}
+		]
+
+		let parents = ruleParents(rawRules.map(enrichRule)[3].dottedName)
+		expect(parents).to.eql([
+			['CDD', 'taxe', 'montant annuel'],
+			['CDD', 'taxe'],
+			['CDD']
+		])
+	})
+	it("should disambiguate a reference to another rule in a rule, given the latter's namespace", function() {
+		let rawRules = [
+			{ nom: 'CDD', question: 'CDD ?' },
+			{ nom: 'taxe', formule: 'montant annuel / 12', espace: 'CDD' },
+			{
+				nom: 'montant annuel',
+				formule: '20 - exonération annuelle',
+				espace: 'CDD . taxe'
+			},
+			{
+				nom: 'exonération annuelle',
+				formule: 20,
+				espace: 'CDD . taxe . montant annuel'
+			}
+		]
+
+		let enrichedRules = rawRules.map(enrichRule),
+			resolved = disambiguateRuleReference(
+				enrichedRules,
+				enrichedRules[2],
+				'exonération annuelle'
+			)
+		expect(resolved).to.eql(
+			'CDD . taxe . montant annuel . exonération annuelle'
+		)
+	})
 })