diff --git a/htdocs/install/mysql/migration/repair.sql b/htdocs/install/mysql/migration/repair.sql
index 737ee1bf511..4c6c4fc1117 100644
--- a/htdocs/install/mysql/migration/repair.sql
+++ b/htdocs/install/mysql/migration/repair.sql
@@ -569,14 +569,19 @@ UPDATE llx_facturedet SET situation_percent = 100 WHERE situation_percent IS NUL
 DELETE FROM llx_rights_def WHERE module = 'hrm' AND perms = 'employee';
 
 
--- Sequence to fix the content of llx_bank.amount_main_currency
--- Note: amount is amount in currency of bank account
+
+-- Sequence to fix the content of llx_bank.amount_main_currency (value was empty and should not for payment on bank account with a different currency so when amount_main_currency is different than amount)
+-- Note: amount is amount in the currency of the bank account
 -- Note: pamount is always amount into the main currency
--- Note: pmulticurrencyamount is in currency of invoice 
--- Note: amount_main_currency must be amount in main currency
+-- Note: pmulticurrencyamount is in the currency of invoice 
+-- Note: amount_main_currency must be NULL or amount in main currency of company (we set it when the currency of the bank account differs from main currency)
 -- DROP TABLE tmp_bank;
--- CREATE TABLE tmp_bank SELECT b.rowid, b.amount, p.rowid as pid, p.amount as pamount, p.multicurrency_amount as pmulticurrencyamount FROM llx_bank as b INNER JOIN llx_bank_url as bu ON bu.fk_bank=b.rowid AND bu.type = 'payment' INNER JOIN llx_paiement as p ON bu.url_id = p.rowid WHERE p.multicurrency_amount <> 0 AND p.multicurrency_amount <> p.amount;
--- UPDATE llx_bank as b SET b.amount_main_currency = (SELECT tb.pamount FROM tmp_bank as tb WHERE tb.rowid = b.rowid) WHERE b.amount_main_currency IS NULL;
+-- CREATE TABLE tmp_bank SELECT b.rowid, b.amount, p.rowid as pid, p.amount as pamount, p.multicurrency_amount as pmulticurrencyamount, b.datec FROM llx_bank as b INNER JOIN llx_bank_url as bu ON bu.fk_bank=b.rowid AND bu.type = 'payment' INNER JOIN llx_paiement as p ON bu.url_id = p.rowid WHERE p.multicurrency_amount <> 0 AND p.multicurrency_amount <> p.amount;
+-- UPDATE llx_bank as b SET b.amount_main_currency = (SELECT tb.pamount FROM tmp_bank as tb WHERE tb.rowid = b.rowid) WHERE b.amount_main_currency IS NULL AND b.rowid IN (SELECT rowid FROM tmp_bank);
 -- DROP TABLE tmp_bank2;
--- CREATE TABLE tmp_bank2 SELECT b.rowid, b.amount, p.rowid as pid, p.amount as pamount, p.multicurrency_amount as pmulticurrencyamount FROM llx_bank as b INNER JOIN llx_bank_url as bu ON bu.fk_bank=b.rowid AND bu.type = 'payment_supplier' INNER JOIN llx_paiementfourn as p ON bu.url_id = p.rowid WHERE p.multicurrency_amount <> 0 AND p.multicurrency_amount <> p.amount;
--- UPDATE llx_bank as b SET b.amount_main_currency = (SELECT tb.pamount FROM tmp_bank2 as tb WHERE tb.rowid = b.rowid) WHERE b.amount_main_currency IS NULL;
+-- CREATE TABLE tmp_bank2 SELECT b.rowid, b.amount, p.rowid as pid, - p.amount as pamount, - p.multicurrency_amount as pmulticurrencyamount, b.datec FROM llx_bank as b INNER JOIN llx_bank_url as bu ON bu.fk_bank=b.rowid AND bu.type = 'payment_supplier' INNER JOIN llx_paiementfourn as p ON bu.url_id = p.rowid WHERE p.multicurrency_amount <> 0 AND p.multicurrency_amount <> p.amount;
+-- UPDATE llx_bank as b SET b.amount_main_currency = (SELECT tb.pamount FROM tmp_bank2 as tb WHERE tb.rowid = b.rowid) WHERE b.amount_main_currency IS NULL AND b.rowid IN (SELECT rowid FROM tmp_bank2);
+
+-- Sequence to fix the content of llx_bank.amount_main_currency (sign was wrong with some version)
+-- UPDATE llx_bank as b SET b.amount_main_currency = -b.amount_main_currency WHERE b.amount IS NOT NULL AND b.amount_main_currency IS NOT NULL AND SIGN(b.amount_main_currency) <> SIGN(b.amount);
+
diff --git a/htdocs/install/mysql/tables/llx_bank.sql b/htdocs/install/mysql/tables/llx_bank.sql
index d0a8e34790b..e5194cadc88 100644
--- a/htdocs/install/mysql/tables/llx_bank.sql
+++ b/htdocs/install/mysql/tables/llx_bank.sql
@@ -25,7 +25,7 @@ create table llx_bank
   datev           date,                      -- date de valeur
   dateo           date,                      -- date operation
   amount          double(24,8) NOT NULL default 0,		-- amount in the currency of the bank account
-  amount_main_currency double(24,8) NULL,				-- amount in the main currency of the company
+  amount_main_currency double(24,8) NULL,				-- amount in the main currency of the company when payment done in a bank account with a different currency
   label           varchar(255),
   fk_account      integer,
   fk_user_author  integer,