diff --git a/src/app/formulaire/elements/select/select-field-target-pam.ts b/src/app/formulaire/elements/select/select-field-target-pam.ts
index 0e699ac253b51e301cae708911e9eca62111726c..5a5a7620c79b5240ac3da48f0d5b32fe294bfe6d 100644
--- a/src/app/formulaire/elements/select/select-field-target-pam.ts
+++ b/src/app/formulaire/elements/select/select-field-target-pam.ts
@@ -1,8 +1,9 @@
 import { ServiceFactory } from "app/services/service-factory";
 import { decodeHtml } from "../../../util/util";
-import { CalculatorType, MacroRugoRemous } from "jalhyd";
+import { CalculatorType, MacroRugoRemous, Message, MessageCode, Session } from "jalhyd";
 import { SelectField } from "./select-field";
 import { FormulaireNode } from "../formulaire-node";
+import { SelectEntry } from "./select-entry";
 
 // Courbe de remous dans une passe à macro-rugo.
 export class SelectFieldTargetPam extends SelectField {
@@ -37,4 +38,18 @@ export class SelectFieldTargetPam extends SelectField {
         // do not override localisation done in populate()
         // ie. avoid what is done by SelectField.updateLocalisation()
     }
+
+    public get errorMessage(): Message {
+        const v = this.getValue();
+        if (v instanceof SelectEntry) {
+            const nubUid = v.value;
+            const nub = Session.getInstance().findNubByUid(nubUid);
+            if (nub.resultHasMultipleValues()) {
+                return new Message(MessageCode.ERROR_MACRORUGOREMOUS_VARIATED_TARGET_PAM);
+            }
+            else {
+                return undefined;
+            }
+        }
+    }
 }
diff --git a/src/locale/messages.en.json b/src/locale/messages.en.json
index 4e7d90e38759eaaee0cca48705421da568e7b618..b744631713bc7cbb4f6aa952608d8bafd451ce81 100755
--- a/src/locale/messages.en.json
+++ b/src/locale/messages.en.json
@@ -777,5 +777,6 @@
     "INFO_VERIF_SPECIES_NUB_OK": "Crossability criteria are met for custom species FORM_ID_%uid%",
     "ERROR_VERIF_PAB_WALL_NOT_CROSSABLE": "Wall #%N% is not crossable",
     "ERROR_VERIF_PAB_DW_NOT_CROSSABLE": "Downwall is not crossable",
-    "WARNING_VERIF_PAR_SPECIES_GROUP": "Species groups 3a, 3b et 7b are discouraged for this pass type"
+    "WARNING_VERIF_PAR_SPECIES_GROUP": "Species groups 3a, 3b et 7b are discouraged for this pass type",
+    "ERROR_MACRORUGOREMOUS_VARIATED_TARGET_PAM": "Target rock-ramp has variated parameters"
 }
diff --git a/src/locale/messages.fr.json b/src/locale/messages.fr.json
index c871dc356ca8d9ebc45c54baabe469e5937a208f..ae4590b375d87d5c03cd3733b86df9ace5f869fe 100755
--- a/src/locale/messages.fr.json
+++ b/src/locale/messages.fr.json
@@ -778,5 +778,6 @@
     "INFO_VERIF_SPECIES_NUB_OK": "FORM_ID_%uid% : OK",
     "ERROR_VERIF_PAB_WALL_NOT_CROSSABLE": "La cloison n°%N% n'est pas franchissable",
     "ERROR_VERIF_PAB_DW_NOT_CROSSABLE": "La cloison aval n'est pas franchissable",
-    "WARNING_VERIF_PAR_SPECIES_GROUP": "Les groupes d'espèces 3a, 3b et 7b sont déconseillés pour ce type de passe"
+    "WARNING_VERIF_PAR_SPECIES_GROUP": "Les groupes d'espèces 3a, 3b et 7b sont déconseillés pour ce type de passe",
+    "ERROR_MACRORUGOREMOUS_VARIATED_TARGET_PAM": "La passe cible comporte des paramètres variés"
 }
\ No newline at end of file