[FIX]stock_currency_valuation: Revert of commit 850ad67

closes #823

Signed-off-by: Filoquin adhoc <maq@adhoc.com.ar>

Author: feg-adhoc

stock_currency_valuation/models/product_template.py

@@ -8,6 +8,7 @@ class productTemplate(models.Model):
     valuation_currency_id = fields.Many2one(related="categ_id.valuation_currency_id",)
     standard_price_in_currency = fields.Float(
         'Cost', compute='_compute_standard_price_in_currency',
+        inverse='_set_standard_price_in_currency',
         search='_search_standard_price_in_currency',
         digits='Product Price', groups="base.group_user",
         readonly=True,
@@ -50,6 +51,11 @@ def _compute_standard_price_in_currency(self):
         for template in (self - unique_variants):
             template.standard_price_in_currency = template.product_variant_ids[:1].standard_price_in_currency
 
+    def _set_standard_price_in_currency(self):
+        for template in self:
+            if len(template.product_variant_ids) == 1:
+                template.product_variant_ids.standard_price_in_currency = template.standard_price_in_currency
+
     def _search_standard_price_in_currency(self, operator, value):
         products = self.env['product.product'].search([('standard_price_in_currency', operator, value)], limit=None)
         return [('id', 'in', products.mapped('product_tmpl_id').ids)]