[FIX]stock_secondary_unit: compute secondary qty for return pickings

Author: mav-adhoc

stock_secondary_unit/models/__init__.py

@@ -4,3 +4,4 @@
 from . import product_product
 from . import product_template
 from . import stock_move
+from . import stock_return_picking

stock_secondary_unit/models/stock_return_picking.py

@@ -0,0 +1,19 @@
+##############################################################################
+# For copyright and license notices, see __manifest__.py file in module root
+# directory
+##############################################################################
+from odoo import models, fields
+
+
+class StockReturnPicking(models.TransientModel):
+    _inherit = 'stock.return.picking'
+
+    def _create_returns(self):
+        # Computes the second quantity for the return picking
+        new_picking, pick_type_id = super()._create_returns()
+        picking = self.env['stock.picking'].browse(new_picking)
+        for move in picking.move_ids:
+            if move.product_uom_qty and move.secondary_uom_id:
+                factor = move.secondary_uom_id.factor or 1.0
+                move.secondary_uom_qty = move.product_uom_qty / factor
+        return new_picking, pick_type_id