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 177166a829b0fb8aa5525c5fb3d67777c4f8d5ad..0e699ac253b51e301cae708911e9eca62111726c 100644
--- a/src/app/formulaire/elements/select/select-field-target-pam.ts
+++ b/src/app/formulaire/elements/select/select-field-target-pam.ts
@@ -9,6 +9,7 @@ export class SelectFieldTargetPam extends SelectField {
     constructor(parent: FormulaireNode) {
         super(parent);
         this._associatedProperty = MacroRugoRemous.NubMacroRugoProp;
+        this._messageWhenEmpty = "INFO_MACRORUGOREMOUS_CREATE_PAM_FIRST";
     }
 
     protected populate() {
diff --git a/src/locale/messages.en.json b/src/locale/messages.en.json
index aac2e0462bccbc2cfd5dc974ade401fe790074ed..4e7d90e38759eaaee0cca48705421da568e7b618 100755
--- a/src/locale/messages.en.json
+++ b/src/locale/messages.en.json
@@ -507,6 +507,7 @@
     "INFO_MACRORUGOREMOUS_TITRE_COURT": "Rock R. Backw. curve",
     "INFO_MACRORUGOREMOUS_TITRE": "Rock-ramp backwater curve",
     "INFO_MACRORUGOREMOUS_DESCRIPTION": "Backwater curve in rock-ramp fishpass",
+    "INFO_MACRORUGOREMOUS_CREATE_PAM_FIRST": "Create first a rock-ramp fishpass",
     "INFO_PARALLELSTRUCTURE_DESCRIPTION": "orifice gate weir threshold free flow submerged discharge stage-discharge",
     "INFO_PARALLELSTRUCTURE_TITRE_COURT": "// structures",
     "INFO_PARALLELSTRUCTURE_TITRE": "Parallel structures",
diff --git a/src/locale/messages.fr.json b/src/locale/messages.fr.json
index ebac0f050c309bf936aebff4026a43f222285fcb..c871dc356ca8d9ebc45c54baabe469e5937a208f 100755
--- a/src/locale/messages.fr.json
+++ b/src/locale/messages.fr.json
@@ -508,6 +508,7 @@
     "INFO_MACRORUGOREMOUS_TITRE_COURT": "C. remous de PAM",
     "INFO_MACRORUGOREMOUS_TITRE": "Courbe de remous de passe à m. rugo.",
     "INFO_MACRORUGOREMOUS_DESCRIPTION": "Courbe de remous d'une passe à macro-rugosités simple",
+    "INFO_MACRORUGOREMOUS_CREATE_PAM_FIRST": "Créer d'abord une passe à macrorugosités simple",
     "INFO_PARALLELSTRUCTURE_DESCRIPTION": "orifice vanne seuil déversoir noyé dénoyé débit",
     "INFO_PARALLELSTRUCTURE_TITRE_COURT": "Ouvrages",
     "INFO_PARALLELSTRUCTURE_TITRE": "Lois d'ouvrages",