diff --git a/source/app/models/main.py b/source/app/models/main.py
index 1c9561f..1850b1d 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -4471,7 +4471,7 @@ class PreFacturas(BaseModel):
             id_product = product.pop('id_product')
             p = Productos.get(Productos.id==id_product)
 
-            product['unidad'] = p.unidad.key
+            product['unidad'] = SATUnidades.get(SATUnidades.id==product['unidad']).key
             product['clave'] = p.clave
             product['clave_sat'] = p.clave_sat
             product['cuenta_predial'] = p.cuenta_predial
@@ -4721,7 +4721,7 @@ class PreFacturasDetalle(BaseModel):
             row = {'id_product': p.producto.id}
             row['clave'] = p.producto.clave
             row['descripcion'] = p.descripcion
-            row['unidad'] = p.producto.unidad.name
+            row['unidad'] = p.producto.unidad.id
             row['cantidad'] = p.cantidad
             row['valor_unitario'] = p.valor_unitario
             row['descuento'] = p.descuento
diff --git a/source/static/js/controller/invoices.js b/source/static/js/controller/invoices.js
index 1f216dc..df0e660 100644
--- a/source/static/js/controller/invoices.js
+++ b/source/static/js/controller/invoices.js
@@ -1376,7 +1376,6 @@ function cmd_prefactura_click(){
         delete rows[i]['id']
         delete rows[i]['delete']
         delete rows[i]['clave']
-        delete rows[i]['unidad']
         delete rows[i]['importe']
         rows[i]['valor_unitario'] = parseFloat(rows[i]['valor_unitario'])
         rows[i]['descuento'] = parseFloat(rows[i]['descuento'])