diff --git a/services/client/common/models/client.js b/services/client/common/models/client.js
index e457b1fef7..106ccd2ef8 100644
--- a/services/client/common/models/client.js
+++ b/services/client/common/models/client.js
@@ -2,7 +2,7 @@ var app = require('../../server/server');
 
 module.exports = function(Client) {
     var models = app.models;
-
+    var loopBackContext = require('loopback-context');
     // Methods
 
     require('../methods/client/activate.js')(Client);
@@ -69,20 +69,22 @@ module.exports = function(Client) {
             done();
         });
     }
-/*
+
     Client.validateAsync('credit', validateCredit, {
         message: 'No tienes privilegios para modificar el crédito'
     });
     function validateCredit(err, done) {
-        // FIXME: Id del usuario actual
-        let userId = 1;
-
+        let ctx = loopBackContext.getCurrentContext();
+        let accessToken = ctx && ctx.get('accessToken');
+        let userId = accessToken.userId;
+        let self = this;
+        
         // Comprueba si el rol del usuario puede asignar esa cantidad
-
+        // para ello mira que roles pueden asignar la cantidad que el usuario ha indicado
         let filter = {
             fields: ['roleFk'],
             where: {
-                maxAmount: {gt: this.credit}
+                maxAmount: {gt: self.credit}
             }
         };
         models.ClientCreditLimit.find(filter,
@@ -102,47 +104,47 @@ module.exports = function(Client) {
                 (_, res) => roleCb(_, res));
         }
         function roleCb(_, count) {
+            //si el usuario no tiene alguno de los roles no continua
             if (!(count > 0)) {
                 err();
                 done();
             } else
-                validate();
+                validate(); //si tiene el rol hay que validar que el último movimiento no fuese crédito 0 insertado por gerencia
         }
 
         // Si se puso a 0 por gerencia, solo gerencia puede aumentarlo
-
         function validate() {
-            let query = 'SELECT MAX(created) created FROM ClientCredit WHERE clientFk = ?';
-            Client.dataSource.connector.execute (query, [this.id],
+            let query = 'SELECT * FROM ClientCredit WHERE clientFk = ? ORDER BY created DESC LIMIT 1';
+            Client.dataSource.connector.execute (query, [self.id],
                 (_, res) => maxCb(_, res));
         }
+
         function maxCb(_, instances) {
-            if (instances.length !== 1) {
+            //console.log('maxCb', instances);
+            if (instances && (instances.length !== 1 || instances[0].employeeFk == userId || instances[0].amount > 0)) {
                 done();
                 return;
             }
+            
+            //el ultimo registro tiene valor 0, hay que comprobar que no fue editado por un gerente
+            let sql = `SELECT count(distinct r.id) as hasManagerRole 
+            FROM ClientCredit cc
+            JOIN Employee em ON (em.id = cc.employeeFk)
+            JOIN Account ac ON (ac.id = em.userFk)
+            JOIN RoleMapping rm ON (rm.principalId = ac.id)
+            JOIN Role r on (r.id = rm.roleId)
+            WHERE rm.principalType = 'USER'
+            AND cc.employeeFk = ${instances[0].employeeFk}
+            AND r.\`name\` = 'manager'`;
 
-            let filter = {
-                fields: ['amount', 'employeeFk', 'employee'],
-                where: {
-                    clientFk: this.id,
-                    created: instances[0].created
-                },
-                include: {
-                    relation: 'employee',
-                    scope: {
-                        fields: ['userFk']
-                    }
-                }
-            };
-            models.ClientCredit.findOne(filter,
-                (_, res) => clientCreditCb(_, res));
+            Client.dataSource.connector.execute(sql, [], (_, res) => clientCreditCb(_, res));
         }
-        function clientCreditCb(_, instance) {
-            if (instance.amount == 0 && instance.employee.userFk != userId)
+
+        function clientCreditCb(_, instance) {            
+            if (instance.length && instance[0].hasManagerRole > 0 )
                 err();
             done();
         }
     }
-*/
+
 };
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