diff --git a/CHANGELOG.md b/CHANGELOG.md
index f203c6457..a2bb2e7e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,4 @@
+
 # Changelog
 
 All notable changes to this project will be documented in this file.
diff --git a/README.md b/README.md
index b420bc44f..53478f425 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,12 @@ For end-to-end tests run from project's root.
 $ npm run test:e2e
 ```
 
+## Generate changeLog test → master
+```
+$ bash changelog.sh
+```
+
+
 ## Visual Studio Code extensions
 
 Open Visual Studio Code, press Ctrl+P and paste the following commands.
diff --git a/changelog.sh b/changelog.sh
new file mode 100644
index 000000000..8cd7b4716
--- /dev/null
+++ b/changelog.sh
@@ -0,0 +1,34 @@
+features_types=(chore feat style)
+changes_types=(refactor perf)
+fix_types=(fix revert)
+file="CHANGELOG.md"
+file_tmp="temp_log.txt"
+file_current_tmp="temp_current_log.txt"
+
+setType(){
+    echo "### $1" >> $file_tmp
+    arr=("$@")
+    echo "" > $file_current_tmp
+    for i in "${arr[@]}"
+    do
+        git log --grep="$i" --oneline --no-merges --format="- %s %d by:%an" master..test >> $file_current_tmp
+    done
+    # remove duplicates
+    sort -o $file_current_tmp -u $file_current_tmp
+    cat $file_current_tmp >> $file_tmp
+    echo "" >> $file_tmp
+    # remove tmp current file
+    [ -e $file_current_tmp ] && rm $file_current_tmp
+}
+
+echo "# Version XX.XX - XXXX-XX-XX" >> $file_tmp
+echo "" >> $file_tmp
+
+setType "Added 🆕" "${features_types[@]}"
+setType "Changed 📦" "${changes_types[@]}"
+setType "Fixed 🛠️" "${fix_types[@]}"
+
+cat $file >> $file_tmp
+mv $file_tmp $file
+
+
diff --git a/db/routines/vn/procedures/worker_checkMultipleDevice.sql b/db/routines/vn/procedures/worker_checkMultipleDevice.sql
new file mode 100644
index 000000000..00df08d49
--- /dev/null
+++ b/db/routines/vn/procedures/worker_checkMultipleDevice.sql
@@ -0,0 +1,24 @@
+DELIMITER $$
+CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`worker_checkMultipleDevice`(
+	vSelf INT
+)
+BEGIN
+/**
+ * Verify if a worker has multiple assigned devices,
+ * except for freelancers.
+ *
+ * @param vUserFk worker id.
+ */
+	DECLARE vHasPda BOOLEAN;
+	DECLARE vIsFreelance BOOLEAN;
+	DECLARE vMaxDevicesPerUser INT;
+	
+	SELECT COUNT(*) INTO vHasPda FROM deviceProductionUser WHERE userFk = vSelf; 
+	SELECT IFNULL(isFreelance, FALSE) INTO vIsFreelance FROM worker WHERE id = vSelf;
+	SELECT IFNULL(maxDevicesPerUser, FALSE)  INTO vMaxDevicesPerUser FROM deviceProductionConfig LIMIT 1;
+
+	IF NOT vIsFreelance AND vHasPda > vMaxDevicesPerUser THEN
+		CALL util.throw('You can only have one PDA');
+	END IF;
+END$$
+DELIMITER ;
diff --git a/db/routines/vn/triggers/deviceProductionUser_afterInsert.sql b/db/routines/vn/triggers/deviceProductionUser_afterInsert.sql
new file mode 100644
index 000000000..3c8a9a51d
--- /dev/null
+++ b/db/routines/vn/triggers/deviceProductionUser_afterInsert.sql
@@ -0,0 +1,8 @@
+DELIMITER $$
+CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`deviceProductionUser_afterInsert`
+	AFTER INSERT ON `deviceProductionUser`
+	FOR EACH ROW
+BEGIN
+	CALL worker_checkMultipleDevice(NEW.userFk);
+END$$
+DELIMITER ;
diff --git a/db/routines/vn/triggers/deviceProductionUser_beforeUpdate.sql b/db/routines/vn/triggers/deviceProductionUser_beforeUpdate.sql
index 055f81790..7318bd99b 100644
--- a/db/routines/vn/triggers/deviceProductionUser_beforeUpdate.sql
+++ b/db/routines/vn/triggers/deviceProductionUser_beforeUpdate.sql
@@ -3,6 +3,8 @@ CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`deviceProductionUser_
 	BEFORE UPDATE ON `deviceProductionUser`
 	FOR EACH ROW
 BEGIN
+	
+	CALL worker_checkMultipleDevice(NEW.userFk);
 	SET NEW.editorFk = account.myUser_getId();
 END$$
 DELIMITER ;
diff --git a/db/routines/vn/views/saleVolume.sql b/db/routines/vn/views/saleVolume.sql
index aec739678..ffc6714c6 100644
--- a/db/routines/vn/views/saleVolume.sql
+++ b/db/routines/vn/views/saleVolume.sql
@@ -37,7 +37,7 @@ FROM (
 			)
 			JOIN `vn`.`volumeConfig` `vc`
 		)
-		JOIN `vn`.`itemCost` `ic` ON(
+		JOIN `vn`.`itemCost` `ic` FORCE INDEX (`PRIMARY`) ON(
 			`ic`.`itemFk` = `s`.`itemFk`
 			AND `ic`.`warehouseFk` = `t`.`warehouseFk`
 		)
diff --git a/db/versions/11010-blackChrysanthemum/00-firstScript.sql b/db/versions/11010-blackChrysanthemum/00-firstScript.sql
new file mode 100644
index 000000000..c8dce54b2
--- /dev/null
+++ b/db/versions/11010-blackChrysanthemum/00-firstScript.sql
@@ -0,0 +1,21 @@
+ALTER TABLE vn.deviceProductionUser DROP INDEX IF EXISTS deviceProductionUser_UN;
+
+ALTER TABLE vn.deviceProductionUser DROP FOREIGN KEY IF EXISTS deviceProductionUser_FK;
+
+ALTER TABLE vn.deviceProductionUser DROP PRIMARY KEY;
+
+ALTER TABLE vn.deviceProductionUser ADD IF NOT EXISTS id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY FIRST;
+
+ALTER TABLE vn.deviceProductionUser ADD CONSTRAINT deviceProductionUser_deviceProduction_FK FOREIGN KEY IF NOT EXISTS (deviceProductionFk) REFERENCES vn.deviceProduction(id);
+
+ALTER TABLE vn.deviceProductionUser ADD CONSTRAINT deviceProductionUser_unique UNIQUE KEY IF NOT EXISTS (deviceProductionFk);
+
+ALTER TABLE vn.deviceProductionUser ADD IF NOT EXISTS simSerialNumber TEXT NULL;
+
+ALTER TABLE vn.deviceProductionConfig ADD IF NOT EXISTS maxDevicesPerUser INT UNSIGNED NULL;
+
+UPDATE vn.deviceProductionConfig SET maxDevicesPerUser=1 WHERE id=1;
+
+INSERT IGNORE INTO salix.ACL (model,property,accessType,permission,principalType,principalId)
+	VALUES ('Worker','getAvailablePda','READ','ALLOW','ROLE','hr');
+
diff --git a/loopback/locale/en.json b/loopback/locale/en.json
index ca76eae42..601a26f5b 100644
--- a/loopback/locale/en.json
+++ b/loopback/locale/en.json
@@ -223,7 +223,8 @@
 	"printerNotExists": "The printer does not exist",
 	"There are not picking tickets": "There are not picking tickets",
 	"ticketCommercial": "The ticket {{ ticket }} for the salesperson {{ salesMan }} is in preparation. (automatically generated message)",
-    "This password can only be changed by the user themselves": "This password can only be changed by the user themselves",
-    "They're not your subordinate": "They're not your subordinate",
-	"InvoiceIn is already booked": "InvoiceIn is already booked"
-}
+	"This password can only be changed by the user themselves": "This password can only be changed by the user themselves",
+	"They're not your subordinate": "They're not your subordinate",
+	"InvoiceIn is already booked": "InvoiceIn is already booked",
+	"This workCenter is already assigned to this agency": "This workCenter is already assigned to this agency"
+}
\ No newline at end of file
diff --git a/loopback/locale/es.json b/loopback/locale/es.json
index f1c57455e..c67f7ecd6 100644
--- a/loopback/locale/es.json
+++ b/loopback/locale/es.json
@@ -355,6 +355,7 @@
 	"No results found": "No se han encontrado resultados",
 	"InvoiceIn is already booked": "La factura recibida está contabilizada",
 	"This workCenter is already assigned to this agency": "Este centro de trabajo ya está asignado a esta agencia",
-    "Select ticket or client": "Elija un ticket o un client",
-	"It was not able to create the invoice": "No se pudo crear la factura"
-}
+	"Select ticket or client": "Elija un ticket o un client",
+	"It was not able to create the invoice": "No se pudo crear la factura",
+	"This PDA is already assigned to another user": "This PDA is already assigned to another user"
+}
\ No newline at end of file
diff --git a/modules/worker/back/methods/worker/getAvailablePda.js b/modules/worker/back/methods/worker/getAvailablePda.js
new file mode 100644
index 000000000..65641a9e6
--- /dev/null
+++ b/modules/worker/back/methods/worker/getAvailablePda.js
@@ -0,0 +1,23 @@
+module.exports = Self => {
+    Self.remoteMethod('getAvailablePda', {
+        description: 'returns devices without user',
+        accessType: 'READ',
+        accepts: [],
+        returns: {
+            type: 'array',
+            root: true
+        },
+        http: {
+            path: `/getAvailablePda`,
+            verb: 'GET'
+        }
+    });
+    Self.getAvailablePda = async() => {
+        return Self.app.models.DeviceProduction.rawSql(
+            `SELECT d.*
+                FROM deviceProduction d
+                    LEFT JOIN deviceProductionUser du ON du.deviceProductionFk = d.id
+                WHERE du.deviceProductionFk IS NULL`
+        );
+    };
+};
diff --git a/modules/worker/back/methods/worker/specs/getAvailablePda.spec.js b/modules/worker/back/methods/worker/specs/getAvailablePda.spec.js
new file mode 100644
index 000000000..c7051f0b4
--- /dev/null
+++ b/modules/worker/back/methods/worker/specs/getAvailablePda.spec.js
@@ -0,0 +1,13 @@
+const models = require('vn-loopback/server/server').models;
+
+describe('worker getAvailablePda()', () => {
+    it('should return a Pda that has no user assigned', async() => {
+        const [{id}] = await models.Worker.getAvailablePda();
+
+        const deviceProductionUser = await models.DeviceProductionUser.findOne({
+            where: {deviceProductionFk: id}
+        });
+
+        expect(!deviceProductionUser).toBeTruthy();
+    });
+});
diff --git a/modules/worker/back/models/device-production-user.js b/modules/worker/back/models/device-production-user.js
new file mode 100644
index 000000000..81af484d3
--- /dev/null
+++ b/modules/worker/back/models/device-production-user.js
@@ -0,0 +1,8 @@
+const UserError = require('vn-loopback/util/user-error');
+module.exports = Self => {
+    Self.rewriteDbError(function(err) {
+        if (err.code === 'ER_DUP_ENTRY')
+            return new UserError(`This PDA is already assigned to another user`);
+        return err;
+    });
+};
diff --git a/modules/worker/back/models/device-production-user.json b/modules/worker/back/models/device-production-user.json
index 35a90fb50..a024cc94c 100644
--- a/modules/worker/back/models/device-production-user.json
+++ b/modules/worker/back/models/device-production-user.json
@@ -14,6 +14,10 @@
         }
     },
     "properties": {
+        "id": {
+            "type": "number",
+            "id": true
+        },
         "deviceProductionFk": {
             "type": "number",
             "id": true
@@ -21,6 +25,9 @@
         "userFk": {
             "type": "number"
         },
+        "simSerialNumber": {
+            "type": "string"
+        },
         "created": {
             "type": "date"
         }
@@ -28,7 +35,7 @@
     "relations": {
         "deviceProduction": {
             "type": "belongsTo",
-            "model": "DeviceProduction",
+            "model": "DeviceProduction",          
             "foreignKey": "deviceProductionFk"
         },
         "user": {
@@ -36,5 +43,10 @@
             "model": "User",
             "foreignKey": "userFk"
         }
+    },
+    "scope": {
+        "include":{
+           "relation": "deviceProduction"
+        }
     }
 }
diff --git a/modules/worker/back/models/worker.js b/modules/worker/back/models/worker.js
index 076f2eaab..0b0e043f2 100644
--- a/modules/worker/back/models/worker.js
+++ b/modules/worker/back/models/worker.js
@@ -20,6 +20,7 @@ module.exports = Self => {
     require('../methods/worker/search')(Self);
     require('../methods/worker/isAuthorized')(Self);
     require('../methods/worker/setPassword')(Self);
+    require('../methods/worker/getAvailablePda')(Self);
 
     Self.validateAsync('fi', tinIsValid, {
         message: 'Invalid TIN'