diff --git a/modules/client/back/models/client-sample.js b/modules/client/back/models/client-sample.js
index a6509efb2..b36d27f84 100644
--- a/modules/client/back/models/client-sample.js
+++ b/modules/client/back/models/client-sample.js
@@ -7,16 +7,44 @@ module.exports = Self => {
 
     Self.observe('before save', async function(ctx) {
         let models = Self.app.models;
-        let data = ctx.instance;
+        let changes = ctx.data || ctx.instance;
 
-        let sample = await models.Sample.findById(data.typeFk);
+        let sample = await models.Sample.findById(changes.typeFk);
 
-        if (sample.hasCompany && !data.companyFk)
+        if (sample.hasCompany && !changes.companyFk)
             throw new UserError('Choose a company');
 
+        // Renew mandate
+        if (sample.code === 'sepa-core') {
+            let mandateType = await models.MandateType.findOne({
+                where: {name: 'CORE'}
+            });
+
+            let oldMandate = await models.Mandate.findOne({
+                where: {
+                    clientFk: changes.clientFk,
+                    companyFk: changes.companyFk,
+                    mandateTypeFk: mandateType.id,
+                    finished: null
+                }
+            });
+
+            // Disable old mandate
+            if (oldMandate)
+                oldMandate.updateAttribute('finished', new Date());
+
+            // Create a new mandate
+            await models.Mandate.create({
+                clientFk: changes.clientFk,
+                companyFk: changes.companyFk,
+                mandateTypeFk: mandateType.id
+            });
+        }
+
+        // Apply workerFk
         let filter = {where: {userFk: ctx.options.accessToken.userId}};
         let worker = await Self.app.models.Worker.findOne(filter);
 
-        data.workerFk = worker.id;
+        changes.workerFk = worker.id;
     });
 };