diff --git a/addons/mrp/models/mrp_bom.py b/addons/mrp/models/mrp_bom.py
index f38cb346007..0c601c33484 100644
--- a/addons/mrp/models/mrp_bom.py
+++ b/addons/mrp/models/mrp_bom.py
@@ -113,7 +113,8 @@ class MrpBom(models.Model):
     def explode(self, product, quantity, picking_type=False):
         """
             Explodes the BoM and creates two lists with all the information you need: bom_done and line_done
-            Quantity should be passed in the UoM of the BoM (don't divide by its quantity)
+            Quantity describes the number of times you need the BoM: so the quantity divided by the number created by the BoM
+            and converted into its UoM
         """
         boms_done = [(self, {'qty': quantity, 'product': product, 'original_qty': quantity, 'parent_line': False})]
         lines_done = []
@@ -129,11 +130,11 @@ class MrpBom(models.Model):
             if current_line.product_id.product_tmpl_id in templates_done:
                 raise UserError(_('Recursion error!  A product with a Bill of Material should not have itself in its BoM or child BoMs!'))
 
-            line_quantity = current_qty * current_line.product_qty / current_line.bom_id.product_qty
+            line_quantity = current_qty * current_line.product_qty
             bom = self._bom_find(product=current_line.product_id, picking_type=picking_type or self.picking_type_id, company_id=self.company_id.id)
             if bom.type == 'phantom':
-                converted_line_quantity = self.env['product.uom']._compute_qty_obj(current_line.product_uom_id, line_quantity, bom.product_uom_id)
-                bom_lines = [(line, current_line.product_id, line_quantity, current_line) for line in bom.bom_line_ids] + bom_lines
+                converted_line_quantity = self.env['product.uom']._compute_qty_obj(current_line.product_uom_id, line_quantity / bom.product_qty, bom.product_uom_id)
+                bom_lines = [(line, current_line.product_id, converted_line_quantity, current_line) for line in bom.bom_line_ids] + bom_lines
                 templates_done |= current_line.product_id.product_tmpl_id
                 boms_done.append((bom, {'qty': converted_line_quantity, 'product': current_product, 'original_qty': quantity, 'parent_line': current_line}))
             else:
diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index 7ff5bbba781..cb9868b9cdc 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -264,7 +264,7 @@ class MrpProduction(models.Model):
     def _generate_moves(self):
         for production in self:
             production._generate_finished_moves()
-            factor = self.env['product.uom']._compute_qty(production.product_uom_id.id, production.product_qty, production.bom_id.product_uom_id.id)
+            factor = self.env['product.uom']._compute_qty(production.product_uom_id.id, production.product_qty, production.bom_id.product_uom_id.id) / production.bom_id.product_qty
             boms, lines = production.bom_id.explode(production.product_id, factor, picking_type=production.bom_id.picking_type_id)
             production._generate_raw_moves(lines)
             # Check for all draft moves whether they are mto or not
@@ -382,7 +382,7 @@ class MrpProduction(models.Model):
         orders_to_plan = self.filtered(lambda order: order.routing_id and order.state == 'confirmed')
         UoM = self.env['product.uom']
         for order in orders_to_plan:
-            quantity = UoM._compute_qty_obj(order.product_uom_id, order.product_qty, order.bom_id.product_uom_id)
+            quantity = UoM._compute_qty_obj(order.product_uom_id, order.product_qty, order.bom_id.product_uom_id) / order.bom_id.product_qty
             boms, lines = order.bom_id.explode(order.product_id, quantity, picking_type=order.bom_id.picking_type_id)
             order._generate_workorders(boms)
         orders_to_plan.write({'state': 'planned'})
@@ -402,18 +402,18 @@ class MrpProduction(models.Model):
                     BoMs
         """
         workorders = self.env['mrp.workorder']
-        qty = bom_data['qty']
+        bom_qty = bom_data['qty']
 
+        # Initial qty producing
         if self.product_id.tracking == 'serial':
             quantity = 1.0
         else:
             quantity = self.product_qty - sum(self.move_finished_ids.mapped('quantity_done'))
             quantity = quantity if (quantity > 0) else 0
 
-        # TDE FIXME: what is qty compared to quantity ??
         for operation in bom.routing_id.operation_ids:
             # create workorder
-            cycle_number = math.ceil(qty / bom.product_qty / operation.workcenter_id.capacity)  # TODO: float_round UP
+            cycle_number = math.ceil(bom_qty / operation.workcenter_id.capacity)  # TODO: float_round UP
             duration_expected = (operation.workcenter_id.time_start +
                                  operation.workcenter_id.time_stop +
                                  cycle_number * operation.time_cycle * 100.0 / operation.workcenter_id.time_efficiency)
diff --git a/addons/mrp/models/mrp_unbuild.py b/addons/mrp/models/mrp_unbuild.py
index a4b8c597edb..e666f079136 100644
--- a/addons/mrp/models/mrp_unbuild.py
+++ b/addons/mrp/models/mrp_unbuild.py
@@ -154,8 +154,8 @@ class MrpUnbuild(models.Model):
     def _generate_produce_moves(self):
         moves = self.env['stock.move']
         for unbuild in self:
-            factor = self.env['product.uom']._compute_qty(unbuild.product_uom_id.id, unbuild.product_qty, unbuild.bom_id.product_uom_id.id)
-            boms, lines = unbuild.bom_id.explode(unbuild.product_id, factor / unbuild.bom_id.product_qty, picking_type=unbuild.bom_id.picking_type_id)
+            factor = self.env['product.uom']._compute_qty(unbuild.product_uom_id.id, unbuild.product_qty, unbuild.bom_id.product_uom_id.id) / unbuild.bom_id.product_qty
+            boms, lines = unbuild.bom_id.explode(unbuild.product_id, factor, picking_type=unbuild.bom_id.picking_type_id)
             for line, line_data in lines:
                 moves += unbuild._generate_move_from_bom_line(line, line_data['qty'])
         return moves
diff --git a/addons/mrp/wizard/change_production_qty.py b/addons/mrp/wizard/change_production_qty.py
index 0e6382fa398..de98b052a81 100644
--- a/addons/mrp/wizard/change_production_qty.py
+++ b/addons/mrp/wizard/change_production_qty.py
@@ -44,7 +44,7 @@ class ChangeProductionQty(models.TransientModel):
                 raise UserError(_("You have already processed %d. Please input a quantity higher than %d ")%(produced, produced))
             production.write({'product_qty': wizard.product_qty})
             bom_point = production.bom_id
-            factor = self.env['product.uom']._compute_qty(production.product_uom_id.id, production.product_qty - production.qty_produced, production.bom_id.product_uom_id.id)
+            factor = self.env['product.uom']._compute_qty(production.product_uom_id.id, production.product_qty - production.qty_produced, production.bom_id.product_uom_id.id) / production.bom_id.product_qty
             boms, lines = production.bom_id.explode(production.product_id, factor, picking_type=production.bom_id.picking_type_id)
             for line, line_data in lines:
                 production._update_raw_move(line, line_data)
@@ -61,7 +61,7 @@ class ChangeProductionQty(models.TransientModel):
                 wo.qty_producing = quantity
                 if wo.qty_produced < wo.qty_production and wo.state == 'done':
                     wo.state = 'progress'
-                # assign moves; last operation receive all unassigned moves (which case ?)
+                # assign moves; last operation receive all unassigned moves
                 operation = wo.operation_id
 
                 # TODO: following could be put in a function as it is similar as code in _workorders_create
diff --git a/addons/purchase_mrp/models/purchase_mrp.py b/addons/purchase_mrp/models/purchase_mrp.py
index 99ff9aaa3eb..993e54d234f 100644
--- a/addons/purchase_mrp/models/purchase_mrp.py
+++ b/addons/purchase_mrp/models/purchase_mrp.py
@@ -27,7 +27,7 @@ class PurchaseOrderLine(models.Model):
         bom_delivered = {}
         if bom:
             bom_delivered[bom.id] = False
-            product_uom_qty_bom = self.env['product.uom']._compute_qty_obj(self.product_uom, self.product_qty, bom.product_uom_id)
+            product_uom_qty_bom = self.env['product.uom']._compute_qty_obj(self.product_uom, self.product_qty, bom.product_uom_id) / bom.product_qty
             boms, lines = bom.explode(self.product_id, product_uom_qty_bom)
             for bom_line, data in lines:
                 qty = 0.0
diff --git a/addons/sale_mrp/sale_mrp.py b/addons/sale_mrp/sale_mrp.py
index 527ef81fa0f..a27f8bfdb05 100644
--- a/addons/sale_mrp/sale_mrp.py
+++ b/addons/sale_mrp/sale_mrp.py
@@ -38,7 +38,7 @@ class SaleOrderLine(models.Model):
         bom = self.env['mrp.bom']._bom_find(product=self.product_id)
         if bom and bom.type == 'phantom':
             bom_delivered[bom.id] = False
-            product_uom_qty_bom = self.env['product.uom']._compute_qty_obj(self.product_uom, self.product_uom_qty, bom.product_uom_id)
+            product_uom_qty_bom = self.env['product.uom']._compute_qty_obj(self.product_uom, self.product_uom_qty, bom.product_uom_id) / bom.product_qty
             boms, lines = bom.explode(self.product_id, product_uom_qty_bom)
             for bom_line, data in lines:
                 qty = 0.0