diff --git a/internal/database/migrations/20260414074213_change_max_vehicle_number.down.sql b/internal/database/migrations/20260414074213_change_max_vehicle_number.down.sql
new file mode 100644
index 00000000..a6b1c98c
--- /dev/null
+++ b/internal/database/migrations/20260414074213_change_max_vehicle_number.down.sql
@@ -0,0 +1,2 @@
+ALTER TABLE purchase_items
+    ALTER COLUMN vehicle_number TYPE VARCHAR(10) USING LEFT(vehicle_number, 10);
diff --git a/internal/database/migrations/20260414074213_change_max_vehicle_number.up.sql b/internal/database/migrations/20260414074213_change_max_vehicle_number.up.sql
new file mode 100644
index 00000000..3fa78c07
--- /dev/null
+++ b/internal/database/migrations/20260414074213_change_max_vehicle_number.up.sql
@@ -0,0 +1,2 @@
+ALTER TABLE purchase_items
+    ALTER COLUMN vehicle_number TYPE VARCHAR(15) USING vehicle_number;
diff --git a/internal/modules/purchases/services/purchase.service.go b/internal/modules/purchases/services/purchase.service.go
index 5324d60f..7497f350 100644
--- a/internal/modules/purchases/services/purchase.service.go
+++ b/internal/modules/purchases/services/purchase.service.go
@@ -10,6 +10,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	commonRepo "gitlab.com/mbugroup/lti-api.git/internal/common/repository"
 	commonSvc "gitlab.com/mbugroup/lti-api.git/internal/common/service"
@@ -46,7 +47,8 @@ type PurchaseService interface {
 }
 
 const (
-	priceTolerance = 0.0001
+	priceTolerance                 = 0.0001
+	purchaseVehicleNumberMaxLength = 15
 )
 
 type purchaseService struct {
@@ -1158,6 +1160,15 @@ func (s *purchaseService) ReceiveProducts(c *fiber.Ctx, id uint, req *validation
 		if payload.VehicleNumber != nil {
 			val := strings.TrimSpace(*payload.VehicleNumber)
 			if val != "" {
+				if utf8.RuneCountInString(val) > purchaseVehicleNumberMaxLength {
+					return nil, utils.BadRequest(
+						fmt.Sprintf(
+							"vehicle_number for item %d must be at most %d characters",
+							payload.PurchaseItemID,
+							purchaseVehicleNumberMaxLength,
+						),
+					)
+				}
 				vehicleNumber = &val
 			} else {
 				clearVehicle = true
diff --git a/internal/modules/purchases/validations/purchase.validation.go b/internal/modules/purchases/validations/purchase.validation.go
index b643501c..ac8ecbf4 100644
--- a/internal/modules/purchases/validations/purchase.validation.go
+++ b/internal/modules/purchases/validations/purchase.validation.go
@@ -45,7 +45,7 @@ type ReceivePurchaseItemRequest struct {
 	TransportPerItem   *float64 `form:"transport_per_item" json:"transport_per_item,omitempty" validate:"omitempty,gte=0"`
 	TravelNumber       *string  `form:"travel_number" json:"travel_number" validate:"omitempty,max=100"`
 	TravelDocumentPath *string  `form:"travel_document_path" json:"travel_document_path" validate:"omitempty,max=1024"`
-	VehicleNumber      *string  `form:"vehicle_number" json:"vehicle_number" validate:"omitempty,max=100"`
+	VehicleNumber      *string  `form:"vehicle_number" json:"vehicle_number" validate:"omitempty,max=15"`
 	ReceivedQty        *float64 `form:"received_qty" json:"received_qty" validate:"omitempty,gte=0"`
 }