diff --git a/e2e/calculate-linked-params.e2e-spec.ts b/e2e/calculate-linked-params.e2e-spec.ts
index 56f8dd05fcb11caf5909a18f4d095c1495b90f45..12e68d423b9cdda3373f74cabd60824086cfb91e 100644
--- a/e2e/calculate-linked-params.e2e-spec.ts
+++ b/e2e/calculate-linked-params.e2e-spec.ts
@@ -304,4 +304,44 @@ describe("ngHyd − calculate with linked parameters", () => {
         expect(Number(volume)).toBeCloseTo(44.565, 3);
     });
 
+    it(" − a link target parameter should not be able to link to another parameter", async () => {
+        debugger
+        // create 1st PAB-Chute
+        await navBar.clickNewCalculatorButton();
+        await browser.sleep(200);
+        await listPage.clickMenuEntryForCalcType(12);
+        await browser.sleep(200);
+
+        //  upstream water level should not have link mode (only one calculator)
+        const Z1_1 = calcPage.getInputById("Z1");
+        expect(await calcPage.inputHasLinkModeButton(Z1_1)).toBe(false);
+
+        // create 2nd PAB-Chute
+        await navBar.clickNewCalculatorButton();
+        await browser.sleep(200);
+        await listPage.clickMenuEntryForCalcType(12);
+        await browser.sleep(200);
+
+        // back to 1st calculator
+        await navBar.clickCalculatorTab(0);
+        await browser.sleep(200);
+
+        //  upstream water level should have link mode (now there are 2 calculators)
+        expect(await calcPage.inputHasLinkModeButton(Z1_1)).toBe(true);
+
+        // back to 2nd calculator
+        await navBar.clickCalculatorTab(1);
+        await browser.sleep(200);
+
+        // link upstream water level in 2nd calculator to upstream water level in 1st one
+        const Z1_2 = calcPage.getInputById("Z1");
+        await calcPage.setParamMode(Z1_2, "link");
+
+        // back to 1st calculator
+        await navBar.clickCalculatorTab(0);
+        await browser.sleep(200);
+
+        //  upstream water level should not have link mode (already a link target)
+        expect(await calcPage.inputHasLinkModeButton(Z1_1)).toBe(false);
+    });
 });
diff --git a/e2e/calculator.po.ts b/e2e/calculator.po.ts
index ed78fc4e299b9cc3de64efa3608c5159554658e8..af1e1803ce378ba967def9837500ece6da58a434 100644
--- a/e2e/calculator.po.ts
+++ b/e2e/calculator.po.ts
@@ -184,6 +184,14 @@ export class CalculatorPage {
         return await button.isPresent();
     }
 
+    async inputHasLinkModeButton(input: ElementFinder) {
+        // get parent (div.container)
+        const container = await this.findParentContainer(input);
+        // find radio buttons
+        const button: ElementFinder = container.element(by.css("mat-button-toggle.radio_link > button"));
+        return await button.isPresent();
+    }
+
     /**
      * @returns true if "fixed mode" button linked to an input is selected
      */