diff --git a/src/app/components/fixedvar-results/fixed-results.component.ts b/src/app/components/fixedvar-results/fixed-results.component.ts
index 5d676ff58a6c1cd83ee93042e48aca5179695aa9..ab00d23500b5ffc722e01a3bcae00b68a843ccd4 100644
--- a/src/app/components/fixedvar-results/fixed-results.component.ts
+++ b/src/app/components/fixedvar-results/fixed-results.component.ts
@@ -8,7 +8,7 @@ import { FormulaireService } from "../../services/formulaire.service";
 import { ResultsComponent } from "./results.component";
 import { AppComponent } from "../../app.component";
 
-import { Structure, capitalize } from "jalhyd";
+import { capitalize } from "jalhyd";
 
 import { sprintf } from "sprintf-js";
 
@@ -95,10 +95,14 @@ export class FixedResultsComponent extends ResultsComponent {
             for (const fp of this.fixedParams) {
                 if (fp.symbol === symbol) {
                     let label = this.formattedLabel(fp);
-                    // add structure position before label
-                    if (fp.paramDefinition.parentNub instanceof Structure) {
-                        const pos = fp.paramDefinition.parentNub.findPositionInParent();
-                        label = this.intlService.localizeText("INFO_OUVRAGE") + " n°" + (pos + 1) + ": " + label;
+                    const nub = fp.paramDefinition.parentNub;
+                    // add child type and position before label
+                    if (nub && nub.parent && nub.parent.childrenType) {
+                        const pos = nub.findPositionInParent();
+                        // label = this.intlService.localizeText("INFO_OUVRAGE") + " n°" + (pos + 1) + ": " + label;
+                        const cn = capitalize(this.intlService.childName(nub.parent));
+                        label = sprintf(this.intlService.localizeText("INFO_STUFF_N"), cn)
+                            + (pos + 1) + ": " + label;
                     }
                     label += this._fixedResults.getHelpLink(symbol);
                     data.push({
@@ -189,10 +193,14 @@ export class FixedResultsComponent extends ResultsComponent {
         // 1. fixed parameters
         for (const fp of this.fixedParams) {
             let label = this.formattedLabel(fp);
-            // add structure position before label
-            if (fp.paramDefinition.parentNub instanceof Structure) {
-                const pos = fp.paramDefinition.parentNub.findPositionInParent();
-                label = this.intlService.localizeText("INFO_OUVRAGE") + " n°" + (pos + 1) + ": " + label;
+            const nub = fp.paramDefinition.parentNub;
+            // add child type and position before label
+            if (nub && nub.parent && nub.parent.childrenType) {
+                const pos = nub.findPositionInParent();
+                // label = this.intlService.localizeText("INFO_OUVRAGE") + " n°" + (pos + 1) + ": " + label;
+                const cn = capitalize(this.intlService.childName(nub.parent));
+                label = sprintf(this.intlService.localizeText("INFO_STUFF_N"), cn)
+                    + (pos + 1) + ": " + label;
             }
             label += this._fixedResults.getHelpLink(fp.symbol);
             data.push({
diff --git a/src/app/components/generic-input/generic-input.component.ts b/src/app/components/generic-input/generic-input.component.ts
index f49b62c0e4ebdfc7d6f8815b6266a017f9db1ae6..0e946cfed7e85da247d361a39223b2c21dee94e4 100644
--- a/src/app/components/generic-input/generic-input.component.ts
+++ b/src/app/components/generic-input/generic-input.component.ts
@@ -1,6 +1,6 @@
 import { Input, Output, EventEmitter, ChangeDetectorRef, OnChanges, ViewChild } from "@angular/core";
 import { NgModel } from "@angular/forms";
-import { isNumeric, Structure, Pab, MacrorugoCompound } from "jalhyd";
+import { isNumeric, Structure, Pab, MacrorugoCompound, SPP } from "jalhyd";
 import { FormulaireDefinition } from "../../formulaire/definition/form-definition";
 import { NgParameter } from "../../formulaire/ngparam";
 import { I18nService } from "../../services/internationalisation.service";
@@ -42,10 +42,9 @@ export abstract class GenericInputComponent implements OnChanges {
             if (this._model instanceof NgParameter) {
                 const param = this._model as NgParameter;
                 id = param.symbol;
-                // if inside a nested Structure, prefix with Structure position
-                // to disambiguate
+                // if inside a child Nub, prefix with child position to disambiguate
                 const nub = param.paramDefinition.parentNub;
-                if (nub && (nub instanceof Structure || nub.parent instanceof Pab || nub.parent instanceof MacrorugoCompound)) {
+                if (nub && nub.parent && nub.parent.childrenType) {
                     id = nub.findPositionInParent() + "_" + id;
                 }
             }
diff --git a/src/app/components/param-computed/param-computed.component.ts b/src/app/components/param-computed/param-computed.component.ts
index b6779c083d1b94e387982d52039ecf76caa40851..54bbe75fb9a94dcd6d9c9e3b8046aae442fbc1ae 100644
--- a/src/app/components/param-computed/param-computed.component.ts
+++ b/src/app/components/param-computed/param-computed.component.ts
@@ -25,10 +25,9 @@ export class ParamComputedComponent {
      */
     public get inputId() {
         let id = "calc_" + this.param.symbol;
-        // if inside a nested Structure, prefix with Structure position
-        // to disambiguate
+        // if inside a child Nub, prefix with child position to disambiguate
         const nub = this.param.paramDefinition.parentNub;
-        if (nub && nub instanceof Structure) {
+        if (nub && nub.parent && nub.parent.childrenType) {
             id = nub.findPositionInParent() + "_" + id;
         }
         return id;
diff --git a/src/app/components/param-link/param-link.component.ts b/src/app/components/param-link/param-link.component.ts
index ab7b72c470193eb6142cba906fac41e843b88170..f12c7cb64085395a19b6c06b89527167bbe538c7 100644
--- a/src/app/components/param-link/param-link.component.ts
+++ b/src/app/components/param-link/param-link.component.ts
@@ -41,10 +41,9 @@ export class ParamLinkComponent implements OnChanges, Observer, OnDestroy {
 
     public get selectId() {
         let id = "linked_" + this.param.symbol;
-        // if inside a nested Structure, prefix with Structure position
-        // to disambiguate
+        // if inside a child Nub, prefix with child position to disambiguate
         const nub = this.param.paramDefinition.parentNub;
-        if (nub && nub instanceof Structure) {
+        if (nub && nub.parent && nub.parent.childrenType) {
             id = nub.findPositionInParent() + "_" + id;
         }
         return id;
diff --git a/src/app/components/param-values/param-values.component.ts b/src/app/components/param-values/param-values.component.ts
index a22cc098c9f4c24ac26af7f548a5473baf3e2c58..6246b682532bdbb0ae75c66e2926be2b2934aec3 100644
--- a/src/app/components/param-values/param-values.component.ts
+++ b/src/app/components/param-values/param-values.component.ts
@@ -45,10 +45,9 @@ export class ParamValuesComponent implements AfterViewInit, Observer {
 
     public get inputId() {
         let id = "var_" + this.param.symbol;
-        // if inside a nested Structure, prefix with Structure position
-        // to disambiguate
+        // if inside a child Nub, prefix with child position to disambiguate
         const nub = this.param.paramDefinition.parentNub;
-        if (nub && nub instanceof Structure) {
+        if (nub && nub.parent && nub.parent.childrenType) {
             id = nub.findPositionInParent() + "_" + id;
         }
         return id;
diff --git a/src/app/formulaire/fieldset.ts b/src/app/formulaire/fieldset.ts
index 64d33ddf1062056b3554792c1a2fc49da219da59..9865597dd405b2f59898bac55c471544d2f03951 100644
--- a/src/app/formulaire/fieldset.ts
+++ b/src/app/formulaire/fieldset.ts
@@ -297,8 +297,8 @@ export class FieldSet extends FormulaireElement implements Observer {
                 this.setSelectValueFromProperty("select_unit", "trigoUnit");
                 break;
 
-            case "spp_operation": // SPP
-                this.setSelectValueFromProperty("spp_operation", "sppOperation");
+            case "fs_spp": // SPP
+                this.setSelectValueFromProperty("select_spp_operation", "sppOperation");
                 break;
         }
     }