diff --git a/code/app/Booking.php b/code/app/Booking.php
index e0461b70..1877216a 100644
--- a/code/app/Booking.php
+++ b/code/app/Booking.php
@@ -240,7 +240,6 @@ public function getValue($type, $with_friends, $force_recalculate = false)
                 }
 
                 foreach ($products as $booked) {
-                    $booked->setRelation('booking', $obj);
                     $value += $booked->getValue($type);
                 }
             }
@@ -385,6 +384,7 @@ public function getProductsWithFriendsAttribute()
             */
             $products = new Collection();
             foreach($this->products as $p) {
+                $p->setRelation('booking', $obj);
                 $products->push($p);
             }
 
@@ -392,6 +392,8 @@ public function getProductsWithFriendsAttribute()
 
             foreach($friends as $sub) {
                 foreach($sub->products as $sub_p) {
+                    $sub_p->setRelation('booking', $sub);
+
                     $master_p = $products->firstWhere('product_id', $sub_p->product_id);
 
                     if (is_null($master_p)) {
@@ -421,10 +423,6 @@ public function getProductsWithFriendsAttribute()
                 return $a->product->name <=> $b->product->name;
             });
 
-            $products = $products->map(function($a) use ($obj) {
-                return $a->setRelation('booking', $obj);
-            });
-
             return $products;
         });
     }
diff --git a/code/app/Importers/CSV/Movements.php b/code/app/Importers/CSV/Movements.php
index 0bc85301..0bdf9681 100644
--- a/code/app/Importers/CSV/Movements.php
+++ b/code/app/Importers/CSV/Movements.php
@@ -23,6 +23,9 @@ public function fields()
             'amount' => (object) [
                 'label' => _i('Valore'),
             ],
+            'identifier' => (object) [
+                'label' => _i('Identificativo'),
+            ],
             'notes' => (object) [
                 'label' => _i('Note'),
             ],
@@ -234,6 +237,7 @@ public function run($request)
         $types = $request->input('mtype', []);
         $methods = $request->input('method', []);
         $amounts = $request->input('amount', []);
+        $identifiers = $request->input('identifier', []);
         $currencies = $request->input('currency_id', []);
 
         $errors = [];
@@ -249,6 +253,7 @@ public function run($request)
                 $m->date = $dates[$index];
                 $m->type = $types[$index];
                 $m->amount = $amounts[$index];
+                $m->identifier = $identifiers[$index];
                 $m->method = $methods[$index];
                 $m->currency_id = $currencies[$index];
                 $m->notes = $notes[$index];
diff --git a/code/app/Movement.php b/code/app/Movement.php
index e990203f..0211cbbd 100644
--- a/code/app/Movement.php
+++ b/code/app/Movement.php
@@ -226,10 +226,16 @@ public static function generate($type, $sender, $target, $amount)
     {
         $ret = new self();
         $ret->type = $type;
-        $ret->sender_type = get_class($sender);
-        $ret->sender_id = $sender->id;
-        $ret->target_type = get_class($target);
-        $ret->target_id = $target->id;
+
+        if ($sender) {
+            $ret->sender_type = get_class($sender);
+            $ret->sender_id = $sender->id;
+        }
+
+        if ($target) {
+            $ret->target_type = get_class($target);
+            $ret->target_id = $target->id;
+        }
 
         $type_descr = movementTypes($type);
         if ($type_descr->fixed_value != false) {
diff --git a/code/app/MovementType.php b/code/app/MovementType.php
index de5713b1..cc1d7d78 100644
--- a/code/app/MovementType.php
+++ b/code/app/MovementType.php
@@ -31,11 +31,22 @@ public function hasPayment($type)
         return array_key_exists($type, $valid);
     }
 
+    /*
+        Per identificare i tipi di movimento contabile che possono essere
+        utilizzati in fase di pagamento di una fattura.
+        Da notare che - controintuitivamente - vengono accolti anche i movimenti
+        circoscritti al GAS e che non coinvolgono il fornitore (o la fattura
+        stessa), per dare la possibilità di registrare altri movimenti in
+        qualche modo correlati (e.g. il costo del bonifico bancario, che non
+        intacca il saldo del fornitore ma solo quello del GAS)
+    */
     public function validForInvoices()
     {
         return (
             ($this->sender_type == 'App\Gas' && ($this->target_type == 'App\Supplier' || $this->target_type == 'App\Invoice')) ||
-            ($this->sender_type == 'App\Supplier' && $this->target_type == 'App\Gas')
+            ($this->sender_type == 'App\Supplier' && $this->target_type == 'App\Gas') ||
+            ($this->sender_type == 'App\Gas' && $this->target_type == null) ||
+            ($this->sender_type == null && $this->target_type == 'App\Gas')
         );
     }
 
diff --git a/code/app/Services/InvoicesService.php b/code/app/Services/InvoicesService.php
index 211c257c..59309650 100644
--- a/code/app/Services/InvoicesService.php
+++ b/code/app/Services/InvoicesService.php
@@ -185,9 +185,6 @@ private function guessPeer($invoice, $mov_target_type, $user)
         else if ($mov_target_type == Gas::class) {
             $peer = $user->gas;
         }
-        else {
-            \Log::error(_('Tipo movimento non riconosciuto durante il salvataggio della fattura'));
-        }
 
         return $peer;
     }
@@ -219,10 +216,6 @@ public function saveMovements($id, $request)
             $type = $movement_types[$i];
 
             list($sender, $target) = $this->movementAttach($type, $user, $invoice);
-            if (is_null($sender) || is_null($target)) {
-                continue;
-            }
-
             $amount = $movement_amounts[$i];
             $mov = Movement::generate($type, $sender, $target, $amount);
             $mov->notes = $movement_notes[$i];
diff --git a/code/resources/views/import/csvmovementsselect.blade.php b/code/resources/views/import/csvmovementsselect.blade.php
index f3c21adb..456823d3 100644
--- a/code/resources/views/import/csvmovementsselect.blade.php
+++ b/code/resources/views/import/csvmovementsselect.blade.php
@@ -91,6 +91,7 @@
                                 <td>
                                     {{ printablePriceCurrency($mov->amount) }}
                                     <x-larastrap::hidden name="amount" npostfix="[]" />
+                                    <x-larastrap::hidden name="identifier" npostfix="[]" />
                                 </td>
                                 <td>
                                     <x-larastrap::selectobj name="currency_id" npostfix="[]" squeeze :options="$currencies" classes="csv_movement_currency_select" />
diff --git a/code/tests/Services/ModifiersServiceTest.php b/code/tests/Services/ModifiersServiceTest.php
index 05a8cbb0..4c6fc540 100644
--- a/code/tests/Services/ModifiersServiceTest.php
+++ b/code/tests/Services/ModifiersServiceTest.php
@@ -782,6 +782,7 @@ public function testWithFriend()
         $mods = $booking->applyModifiers(null, true);
         $this->assertEquals($mods->count(), 1);
         $second_initial_amount = $booking->getValue('booked', true);
+        $this->assertTrue($second_initial_amount > 0);
         $this->assertEquals($second_initial_amount, $initial_amount + $amount_of_friend);
         $second_initial_amount = $booking->getValue('effective', true);
         $this->assertEquals(round($second_initial_amount, 2), round(($initial_amount + $amount_of_friend) * 1.10, 2));