diff --git a/src/db/_accounts.rs b/src/db/_accounts.rs
index 7a5fc09..0a6a095 100644
--- a/src/db/_accounts.rs
+++ b/src/db/_accounts.rs
@@ -303,6 +303,7 @@ pub fn is_owner(tx: &Connection, account_id: &AccountId, user_id: &UserId) -> Cu
 pub struct AccountChangeReceipt {
     pub account_id: AccountId,
     pub security_id: SecurityId,
+    pub account_type: AccountType,
     pub version: i64,
     pub timestamp: i64,
     pub amount: i64,
@@ -316,6 +317,7 @@ impl AccountChangeReceipt {
             amount: row.get("amount")?,
             timestamp: row.get("timestamp")?,
             security_id: SecurityId::from_id(row.get("security_id")?),
+            account_type: AccountType::from_row(row)?
         })
     }
 }
@@ -341,18 +343,16 @@ pub fn add_to_account(
     amount: i64,
 ) -> CustomResult<AccountChangeReceipt> {
     let q = "
-        UPDATE accounts SET amount = CASE account_type
-                                         WHEN 'security_emitter'
-                                            THEN amount
-                                         ELSE amount + ?1 END,
+        UPDATE accounts SET amount = amount + ?1,
                             version = version + 1,
                             timestamp = CURRENT_TIMESTAMP
         WHERE id = ?2
         RETURNING id,
                   version,
                   amount,
-                  UNIXEPOCH(CURRENT_TIMESTAMP) as timestamp,
-                  security as security_id
+                  UNIXEPOCH(CURRENT_TIMESTAMP) AS timestamp,
+                  account_type AS acc_account_type,
+                  security AS security_id
     ";
     let params = params![amount, account_id];
     let ret = tx
@@ -516,16 +516,16 @@ mod test_accounts {
         let user = users.get(0).unwrap().id();
         let acc = create_security_emitter_account(&tx, &sec, &user)?;
 
-        let receipt = add_to_account(&tx, &acc.id(), 33)?;
+        let receipt = add_to_account(&tx, &acc.id(), -33)?;
         assert_eq!(receipt.account_id, acc.id());
-        assert_eq!(receipt.amount, 0);
+        assert_eq!(receipt.amount, -33);
         assert_eq!(receipt.version, 1);
         tx.commit().unwrap();
 
         let tx2 = conn.transaction().unwrap();
         let acc = get_account_by_id(&tx2, &acc.id()).unwrap();
         assert_eq!(acc.timestamp, receipt.timestamp);
-        assert_eq!(acc.amount, 0);
+        assert_eq!(acc.amount, -33);
 
         assert_eq!(get_account_history(&tx2, &acc.id())?.len(), 2);
         Ok(())
diff --git a/src/services/_transactions.rs b/src/services/_transactions.rs
index 500d64a..5772ba7 100644
--- a/src/services/_transactions.rs
+++ b/src/services/_transactions.rs
@@ -1,6 +1,7 @@
 use rusqlite::{ffi, params, Connection, Savepoint, Transaction};
 
 use crate::db::accounts;
+use crate::db::accounts::AccountType;
 
 use crate::db::cheques::{Cheque, WireTransferRequest};
 use crate::db::external_id::AccountId;
@@ -17,9 +18,9 @@ fn _transfer_securities_from_one_account_to_another(
 )> {
     let drawer_receipt = accounts::add_to_account(tx, drawer_account_id, -amount)?;
     let payee_receipt = accounts::add_to_account(tx, payee_account_id, amount)?;
-    if drawer_receipt.amount < 0 {
+    if drawer_receipt.amount < 0 && drawer_receipt.account_type != AccountType::SecurityEmitter {
         let m = format!(
-            "Drawer of {:?} does not have sufficient amount in account.",
+            "Drawer of {:} does not have sufficient amount in account.",
             drawer_account_id
         );
         return Err(Error::InvalidAmount(m));
@@ -177,7 +178,7 @@ fn cash_cheque_unsafe(
     if !accounts::is_owner(&savepoint, payee_account_id, &cheque.payee_user_id)? {
         return Err(Error::InvalidPayee(format!(
             "Trying to cash the cheque {:?} in \
-        an account {:?} that is not owned by the payee.",
+        an account {:} that is not owned by the payee.",
             cheque, payee_account_id
         )));
     }
@@ -207,12 +208,12 @@ fn cash_wire_transfer_request_unsafe(
     savepoint: &Savepoint,
     wire_transfer: &WireTransferRequest,
 ) -> CustomResult<()> {
-    if wire_transfer.amount < 0 {
-        return Err(Error::InvalidAmount(format!(
-            "The cheque {:?} has a negative amount.",
-            wire_transfer
-        )));
-    }
+    // if wire_transfer.amount < 0 {
+    //     return Err(Error::InvalidAmount(format!(
+    //         "The cheque {:?} has a negative amount.",
+    //         wire_transfer
+    //     )));
+    // }
     let (drawer_receipt, payee_receipt) = _transfer_wire_transfer_securities(&savepoint, wire_transfer)?;
     _add_wire_transfer_request_to_wire_transfers_log(&savepoint, wire_transfer, &drawer_receipt, &payee_receipt)?;
     Ok(())
@@ -407,6 +408,22 @@ mod test_caching_cheques {
         }
     }
 
+    #[test]
+    fn test_unfounded_cheque() -> CustomResult<()> {
+        let (mut conn, drawer, payee, payee_account) = setup_basic();
+        let mut tx = conn.transaction().unwrap();
+
+        let cheque = Cheque::new(drawer, payee, 1_000_000, 99);
+
+        let ret = cash_cheque(&mut tx, &cheque, &payee_account);
+        match ret {
+            Err(Error::InvalidAmount(_)) => Ok(()),
+            _ => Err(Error::Testing(
+                "Expected invalid amount error here.".to_string(),
+            )),
+        }
+    }
+
     #[test]
     fn test_negative_security_emitter_cheque() -> CustomResult<()> {
         let (mut conn, security_emitter, payee, payee_account) = setup_security_emitter();