changes

app/models.py

@@ -1720,9 +1720,7 @@ class Payment_Schedule(AutoCodeModel):
     class Meta: 
         db_table = 'payment_schedule'
 
-class Invoice(AutoCodeModel):
-    code_prefix = "HD"
-    code_padding = 5
+class Invoice(models.Model):
     link = models.CharField(max_length=100, null=True)
     ref_code = models.CharField(max_length=30, null=True)
     amount = models.DecimalField(max_digits=35, decimal_places=2)