diff --git a/src/components/TransactionEditor.vue b/src/components/TransactionEditor.vue
index ee60f32..a4bf3ec 100644
--- a/src/components/TransactionEditor.vue
+++ b/src/components/TransactionEditor.vue
@@ -339,7 +339,7 @@
 	
 	async function onAmountChange(posting: EditingPosting) {
 		// Synchronise the amounts if only two postings
-		if (transaction.postings.length == 2) {
+		if (transaction.postings.length === 2 && posting === transaction.postings[0]) {
 			for (const otherPosting of transaction.postings) {
 				if (otherPosting !== posting) {
 					otherPosting.amount_abs = posting.amount_abs;
diff --git a/src/db.ts b/src/db.ts
index dc66945..641ac0e 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -23,7 +23,7 @@ import { readTextFile } from '@tauri-apps/plugin-fs';
 import Database from '@tauri-apps/plugin-sql';
 import { reactive } from 'vue';
 
-import { Balance } from './amounts.ts';
+import { asCost } from './amounts.ts';
 import { ExtendedDatabase } from './dbutil.ts';
 import { CriticalError } from './error.ts';
 
@@ -274,12 +274,11 @@ export class Transaction {
 	) {}
 	
 	doesBalance(): boolean {
-		const balance = new Balance();
+		let total = 0;
 		for (const posting of this.postings) {
-			balance.add(posting.quantity, posting.commodity);
+			total += asCost(posting.quantity, posting.commodity);
 		}
-		balance.clean();
-		return balance.amounts.length === 0;
+		return total === 0;
 	}
 }