diff --git a/process/payments/reactions.ts b/process/payments/reactions.ts
index c91be25..a1cf67a 100644
--- a/process/payments/reactions.ts
+++ b/process/payments/reactions.ts
@@ -3,10 +3,11 @@
 import type { ApolloClient } from '@apollo/client';
 import type { QueryClient } from '@tanstack/react-query';
 import { selectSeasonType } from 'config/default-options';
-import { reaction, toJS } from 'mobx';
+import { comparer, reaction, toJS } from 'mobx';
 import type { CalculationOptions } from 'stores/calculation/options/types';
 import type RootStore from 'stores/root';
 import type { Row } from 'stores/tables/payments/types';
+import { difference } from 'tools/array';
 import validatePaymentsTable from './validation';
 
 export default function paymentsReactions(
@@ -314,6 +315,43 @@ export default function paymentsReactions(
     }
   );
 
+  reaction(
+    () => {
+      const graphType = $calculation.getElementValue('radioGraphType');
+      const payments = toJS($tables.payments.values);
+      const degressionType = $calculation.getElementValue('selectSeasonType');
+
+      return {
+        graphType,
+        payments,
+        degressionType,
+      };
+    },
+    (nextParams, prevParams) => {
+      if (nextParams.graphType === 100_000_001 && nextParams.degressionType === 100_000_007) {
+        const index = difference(nextParams.payments, prevParams.payments);
+
+        if (index) {
+          const value = nextParams.payments[index];
+          const payments = nextParams.payments.slice(1, -1).map((payment, i) => {
+            if (i <= index - 2) return payment;
+
+            return value;
+          });
+
+          const firstPaymentPerc = $calculation.getElementValue('tbxFirstPaymentPerc');
+          const lastPaymentPerc = $calculation.getElementValue('tbxLastPaymentPerc');
+
+          $tables.payments.setValues([firstPaymentPerc, ...payments, lastPaymentPerc]);
+        }
+      }
+    },
+    {
+      delay: 10,
+      equals: comparer.structural,
+    }
+  );
+
   let removeError: () => void;
 
   reaction(
@@ -333,6 +371,10 @@ export default function paymentsReactions(
       if (errorText) {
         removeError = $tables.payments.validation.addError(errorText);
       }
+    },
+    {
+      delay: 10,
+      equals: comparer.structural,
     }
   );
 }
diff --git a/tools/array.ts b/tools/array.ts
index 10ea29b..fd75999 100644
--- a/tools/array.ts
+++ b/tools/array.ts
@@ -1,4 +1,15 @@
-/* eslint-disable import/prefer-default-export */
-export function areEqual(arr1: Array<any>, arr2: Array<any>) {
+export function areEqual<T>(arr1: ReadonlyArray<T>, arr2: ReadonlyArray<T>) {
   return arr1.length === arr2.length && arr1.every((value, index) => value === arr2[index]);
 }
+
+export function difference<T>(arr1: ReadonlyArray<T>, arr2: ReadonlyArray<T>) {
+  if (arr1.length !== arr2.length) return null;
+  // eslint-disable-next-line unicorn/no-for-loop
+  for (let i = 0; i < arr1.length; i += 1) {
+    if (arr1[i] !== arr2[i]) {
+      return i;
+    }
+  }
+
+  return null;
+}