diff --git a/src/card/entities/account.entity.ts b/src/card/entities/account.entity.ts
index d57bec8..9973d50 100644
--- a/src/card/entities/account.entity.ts
+++ b/src/card/entities/account.entity.ts
@@ -22,10 +22,28 @@ export class Account {
   @Column('varchar', { length: 255, nullable: false, name: 'currency' })
   currency!: string;
 
-  @Column('decimal', { precision: 10, scale: 2, default: 0.0, name: 'balance' })
+  @Column('decimal', {
+    precision: 10,
+    scale: 2,
+    default: 0.0,
+    name: 'balance',
+    transformer: {
+      to: (value: number) => value,
+      from: (value: string) => parseFloat(value),
+    },
+  })
   balance!: number;
 
-  @Column('decimal', { precision: 10, scale: 2, default: 0.0, name: 'reserved_balance' })
+  @Column('decimal', {
+    precision: 10,
+    scale: 2,
+    default: 0.0,
+    name: 'reserved_balance',
+    transformer: {
+      to: (value: number) => value,
+      from: (value: string) => parseFloat(value),
+    },
+  })
   reservedBalance!: number;
 
   @OneToMany(() => Card, (card) => card.account, { cascade: true })
diff --git a/src/card/services/account.service.ts b/src/card/services/account.service.ts
index 2ab2d6a..e6ac155 100644
--- a/src/card/services/account.service.ts
+++ b/src/card/services/account.service.ts
@@ -65,7 +65,7 @@ export class AccountService {
 
   increaseReservedBalance(account: Account, amount: number) {
     if (account.balance < account.reservedBalance + amount) {
-      throw new UnprocessableEntityException('ACCOUNT.INSUFFICIENT_BALANCE');
+      throw new UnprocessableEntityException('CARD.INSUFFICIENT_BALANCE');
     }
     return this.accountRepository.increaseReservedBalance(account.id, amount);
   }