diff --git a/models/partner.py b/models/partner.py
index 0c888db..344117f 100644
--- a/models/partner.py
+++ b/models/partner.py
@@ -118,7 +118,6 @@ class partner(models.Model):
     )
     
     key=fields.Char(
-        compute='_compute_key',
         string="Key",
         store=True,
         readonly=True
@@ -128,15 +127,57 @@ class partner(models.Model):
     npai_count=fields.Integer(String="NPAI count", readonly=True)
     source=fields.Char(String="source")
     
+    def _alpha(self,id):
+        alpha={}
+        alpha[1]='A'
+        alpha[2]='B'
+        alpha[3]='C'
+        alpha[4]='D'
+        alpha[5]='E'
+        alpha[6]='F'
+        alpha[7]='G'
+        alpha[8]='H'
+        alpha[9]='I'
+        alpha[10]='J'
+        alpha[11]='K'
+        alpha[12]='L'
+        alpha[13]='M'
+        alpha[14]='N'
+        alpha[15]='O'
+        alpha[16]='P'
+        alpha[17]='Q'
+        alpha[18]='R'
+        alpha[19]='S'
+        alpha[20]='T'
+        alpha[21]='U'
+        alpha[22]='V'
+        alpha[23]='W'
+        alpha[24]='X'
+        alpha[25]='Y'
+        alpha[26]='Z'
+        return (alpha[id%26])
+
     def _compute_key(self):
-        for rec in self:
-            rec.key=int(rec.id)*40456
+        
+        
+        self.key==self._alpha(int(self.id))
+
+    
+    @api.model
+    def create(self, values):
+        # Override the original create function for the res.partner model
+        record = super(partner, self).create(values)
+ 
+        # Change the values of a variable in this super function
+        record['key'] = self._alpha(int(record.id))
+    
+        # Return the record so that the changes are applied and everything is stored.
+        return record
 
     def _compute_all_key(self):
 
-       
-            for rec in self.env['res.partner'].search([]):
-             rec.key=int(rec.id)*40456
+        for rec in self.env['res.partner'].search([]):
+            rec.key=self._alpha(int(rec.id))
            
     
     def _update_source(self):