[FIX] stock_secondary_unit: partial delivery

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_picking

stock_secondary_unit/models/stock_picking.py

@@ -0,0 +1,29 @@
+from odoo import models
+
+
+class StockPicking(models.Model):
+    _inherit = "stock.picking"
+
+    def _create_backorder(self):
+        res = super(StockPicking, self)._create_backorder()
+        for original_move in self.move_ids:
+            corresponding_move = next(
+                (
+                    move
+                    for move in res.move_ids
+                    if move.product_id == original_move.product_id
+                ),
+                None,
+            )
+            if corresponding_move and corresponding_move.secondary_uom_qty:
+                # To avoid rounding errors, Saving the current value of product_uom_qty
+                # before recalculating the secondary unit. Afterward,
+                # I'll restore the original value
+                product_uom_qty = corresponding_move.product_uom_qty
+                corresponding_move.with_context(
+                    bypass_compute_field_qty=True
+                )._compute_secondary_uom_qty()
+                corresponding_move.product_uom_qty = product_uom_qty
+            else:
+                continue
+        return res