diff --git a/db/selectShelving.js b/db/selectShelving.js
new file mode 100644
index 0000000..fe006a8
--- /dev/null
+++ b/db/selectShelving.js
@@ -0,0 +1,11 @@
+const con = require('./connect');
+
+function shelvingExist(shelving, callback) {
+    const consSql = `SELECT * FROM vn.shelving WHERE code = ?`;
+    con.query(consSql, shelving, function(err, result, fields) {
+        callback(null, result);
+    });
+}
+
+exports.shelvingExist = shelvingExist;
+
diff --git a/methods/bindShelvingTag.js b/methods/bindShelvingTag.js
index b359ff9..edfbf0b 100644
--- a/methods/bindShelvingTag.js
+++ b/methods/bindShelvingTag.js
@@ -14,11 +14,13 @@ router.get('/:smartTagFk&:shelving&:level', async(req, res) => {
     const result = bindShelvingTag(smartTagFk, shelving, level);
 
     if (result == 'INVALID_PLATE')
-        res.json({message: 'MATRICULA INCORRECTA'});
+        throw new Error('CODIGO MATRICULA INCORRECTO');
     else if (result == 'INVALID_TAG_CODE')
-        res.json({message: 'CODIGO DE ETIQUETA INCORRECTO'});
+        throw new Error('CODIGO DE ETIQUETA INCORRECTO');
     else
         res.json({message: 'SUCCESS'});
+
+    return;
 });
 
 module.exports = router;
diff --git a/utilities/filter.js b/utilities/filter.js
index 0a88e48..c5e3031 100644
--- a/utilities/filter.js
+++ b/utilities/filter.js
@@ -1,24 +1,14 @@
+const select = require('../db/selectShelving');
 function isSmartTag(toFilter) {
     const exp = /^A0A3B82[A-F0-9]{5}$/;
     return exp.test(toFilter);
 }
-let n = true;
+
 function isShelving(toFilter) {
-    if (!Array.isArray(toFilter)) {
-        let s = toFilter;
-        toFilter = Array;
-        toFilter[0] = s;
-    }
-    const exp = /^[A-Z]{3}$/;
-    for (let i = 0; i < toFilter.length; i++) {
-        let state = exp.test(toFilter[i]);
-        if (state == false)
-            n = false;
-    }
-    if (n == false)
-        return false;
-    else
-        return true;
+    console.log(select.shelvingExist(toFilter, function(err, data) {
+        console.log(data);
+    }));
+    return select.shelvingExist(toFilter);
 }
 exports.isSmartTag = isSmartTag;
 exports.isShelving = isShelving;