diff -r 3e498aa25675 web/org.openbravo.retail.posterminal/js/utils/ob-utilitiesuipos.js
--- a/web/org.openbravo.retail.posterminal/js/utils/ob-utilitiesuipos.js	Fri Aug 30 14:58:19 2019 +0200
+++ b/web/org.openbravo.retail.posterminal/js/utils/ob-utilitiesuipos.js	Fri Aug 30 14:59:03 2019 +0200
@@ -11,6 +11,9 @@
 
 OB.UTIL = window.OB.UTIL || {};
 
+OB.UTIL.masterdataRefreshStatus = '';
+OB.UTIL.backgroundMasterdataRefreshEnabled;
+
 OB.UTIL.sendLastTerminalStatusValues = function (callback) {
   var process = new OB.DS.Process('org.openbravo.retail.posterminal.process.LastTerminalStatusTimestamps');
   process.exec({
@@ -559,10 +562,39 @@
 };
 
 OB.UTIL.checkRefreshMasterData = function () {
+  // this code is called on:
+  // - ticket close
+  // - timeout of force refresh time
+  // - window navigation
   if (
   OB.MobileApp.model.get('refreshMasterdata') === true && OB.UTIL.refreshMasterDataGetProperty('allowedIncrementalRefresh')) {
-    OB.UTIL.clearFlagAndTimersRefreshMasterData();
-    OB.UTIL.refreshMasterData();
+    if (
+    OB.UTIL.backgroundMasterdataIsEnabled() && !OB.UTIL.localStorage.getItem('neededForeGroundMasterDataRefresh')) {
+      // background
+      // this is the save, the request was called in OB.UTIL.loadModelsIncFunc
+      if (OB.UTIL.masterdataRefreshStatus !== 'background-request-finished') {
+        OB.info("Cannot start masterdata save because the espected status was 'background-request-finished', but it was: " + OB.UTIL.masterdataRefreshStatus);
+      } else {
+        OB.UTIL.clearFlagAndTimersRefreshMasterData();
+        if (OB.DS.masterdataBackgroundModels.totalLength > 0) {
+          OB.UTIL.refreshMasterDataInBackgroundSave();
+        } else {
+          OB.info('No updates in the masterdata.');
+        }
+      }
+    } else {
+      // foreground
+      if (OB.UTIL.localStorage.getItem('neededForeGroundMasterDataRefresh')) {
+        OB.info('Detected that previous masterdata refresh in background has fail because execeeds the limit of data. Trying normal refresh.');
+      }
+      if (
+      OB.UTIL.masterdataRefreshStatus !== '' && OB.UTIL.masterdataRefreshStatus !== 'background-request-finished') {
+        OB.info("Cannot start masterdata refresh in foreground because the espected status was '' or 'background-request-finished', but it was: " + OB.UTIL.masterdataRefreshStatus);
+      } else {
+        OB.UTIL.clearFlagAndTimersRefreshMasterData();
+        OB.UTIL.refreshMasterDataForeground();
+      }
+    }
   }
 };
 
@@ -572,12 +604,49 @@
     OB.UTIL.checkRefreshMasterData();
   }
 };
-OB.UTIL.refreshMasterData = function () {
+
+OB.UTIL.refreshMasterDataInBackgroundRequest = function () {
+  if (
+  OB.UTIL.masterdataRefreshStatus !== '' && OB.UTIL.masterdataRefreshStatus !== 'background-request-finished') {
+    OB.info('Cannot start the masterdata requests because the expected status was "" or "background-request-finished" but it was: ' + OB.UTIL.masterdataRefreshStatus);
+    return;
+  }
+  OB.UTIL.masterdataRefreshStatus = 'background-request-started';
+  OB.DS.masterdataBackgroundModels = {};
+  OB.MobileApp.model.loadModels(
+  null, true, function () {
+    OB.UTIL.masterdataRefreshStatus = 'background-request-finished';
+  }, 'background-request');
+};
+
+OB.UTIL.refreshMasterDataInBackgroundSave = function () {
+  OB.UTIL.masterdataRefreshStatus = 'background-save-started';
+  if (OB.UTIL.RfidController.isRfidConfigured()) {
+    OB.UTIL.RfidController.disconnectRFIDDevice();
+  }
+  OB.UTIL.startLoadingSteps();
+  OB.MobileApp.model.set('isLoggingIn', true);
+  OB.UTIL.showLoading(true);
+  OB.MobileApp.model.loadModels(
+  null, true, function () {
+    OB.UTIL.masterdataRefreshStatus = '';
+    OB.DS.masterdataBackgroundModels = {};
+    OB.UTIL.showLoading(false);
+    if (OB.UTIL.RfidController.isRfidConfigured()) {
+      OB.UTIL.RfidController.connectRFIDDevice();
+    }
+    OB.MobileApp.model.set('isLoggingIn', false);
+  }, 'background-save');
+};
+
+OB.UTIL.refreshMasterDataForeground = function () {
+  OB.DS.masterdataBackgroundModels = {};
   OB.MobileApp.model.set('secondsToRefreshMasterdata', 3);
   var counterIntervalId = null;
   counterIntervalId = setInterval(function () {
     OB.MobileApp.model.set('secondsToRefreshMasterdata', OB.MobileApp.model.get('secondsToRefreshMasterdata') - 1);
     if (OB.MobileApp.model.get('secondsToRefreshMasterdata') === 0) {
+      OB.UTIL.masterdataRefreshStatus = 'foreground-started';
       OB.MobileApp.model.set('refreshMasterdataShowPopup', false);
       clearInterval(counterIntervalId);
       if (OB.UTIL.RfidController.isRfidConfigured()) {
@@ -592,6 +661,8 @@
           OB.UTIL.RfidController.connectRFIDDevice();
         }
         OB.MobileApp.model.set('isLoggingIn', false);
+        OB.UTIL.localStorage.removeItem('neededForeGroundMasterDataRefresh');
+        OB.UTIL.masterdataRefreshStatus = '';
       });
     }
   }, 1000);
@@ -656,8 +727,13 @@
     OB.info(msg);
     OB.UTIL.showWarning(msg);
   }
+  if (
+  OB.UTIL.backgroundMasterdataIsEnabled() && !OB.UTIL.localStorage.getItem('neededForeGroundMasterDataRefresh')) {
+    OB.UTIL.refreshMasterDataInBackgroundRequest();
+  }
   OB.MobileApp.model.set('refreshMasterdata', true);
   if (!OB.UTIL.isNullOrUndefined(minShowIncRefresh) && minShowIncRefresh >= 0) {
+    // Forced refresh by timeout, ticket close also calls to checkRefreshMasterData
     var noActivityTimeout = OB.MobileApp.model.get('refreshMasterdataNoActivityTimeout');
     if (OB.UTIL.isNullOrUndefined(noActivityTimeout)) {
       OB.MobileApp.model.set('refreshMasterdataNoActivityTimeout', true);
@@ -670,6 +746,21 @@
   }
 };
 
+OB.UTIL.backgroundMasterdataIsEnabled = function () {
+  if (OB.UTIL.backgroundMasterdataRefreshEnabled === undefined) {
+    let preferenceValue = OB.MobileApp.model.hasPermission('OBMOBC_BackgroundMasterdataMaxSize', true);
+    if (!preferenceValue || (preferenceValue && !isNaN(preferenceValue) && preferenceValue >= 1)) {
+      OB.UTIL.backgroundMasterdataRefreshEnabled = true;
+    } else {
+      OB.UTIL.backgroundMasterdataRefreshEnabled = false;
+      if (isNaN(preferenceValue)) {
+        OB.warn('OBMOBC_BackgroundMasterdataMaxSize has a value not numeric: ' + preferenceValue);
+      }
+    }
+  }
+  return OB.UTIL.backgroundMasterdataRefreshEnabled;
+};
+
 OB.UTIL.getCalculatedPriceForService = function (
 line, product, relatedLines, serviceLineQty, callback, errorCallback) {
   var amountBeforeDiscounts = 0,