diff --git a/internal/entities/purchase_item.go b/internal/entities/purchase_item.go
index 724c6376..a29d4173 100644
--- a/internal/entities/purchase_item.go
+++ b/internal/entities/purchase_item.go
@@ -21,6 +21,7 @@ type PurchaseItem struct {
 	Price                 float64 `gorm:"type:numeric(15,3);default:0"`
 	TotalPrice            float64 `gorm:"type:numeric(15,3);default:0"`
 	ExpenseNonstockId     *uint64
+	HasChickin            bool `gorm:"-" json:"-"`
 
 	// Relations
 	ExpenseNonstock  *ExpenseNonstock  `gorm:"foreignKey:ExpenseNonstockId;references:Id"`
diff --git a/internal/modules/purchases/dto/purchase.dto.go b/internal/modules/purchases/dto/purchase.dto.go
index c8df2294..849ffd63 100644
--- a/internal/modules/purchases/dto/purchase.dto.go
+++ b/internal/modules/purchases/dto/purchase.dto.go
@@ -67,6 +67,7 @@ type PurchaseItemDTO struct {
 	VehicleNumber      *string                            `json:"vehicle_number"`
 	TransportPerItem   *float64                           `json:"transport_per_item,omitempty"`
 	ExpeditionVendor   *supplierDTO.SupplierRelationDTO   `json:"expedition_vendor,omitempty"`
+	HasChickin         bool                               `json:"has_chickin"`
 }
 
 type PoExpeditionDTO struct {
@@ -100,6 +101,7 @@ func ToPurchaseItemDTO(item entity.PurchaseItem) PurchaseItemDTO {
 		TravelNumber:       item.TravelNumber,
 		TravelDocumentPath: item.TravelNumberDocs,
 		VehicleNumber:      item.VehicleNumber,
+		HasChickin:         item.HasChickin,
 	}
 
 	if item.Product != nil && item.Product.Id != 0 {
diff --git a/internal/modules/purchases/services/purchase.service.go b/internal/modules/purchases/services/purchase.service.go
index 703c04b9..6ecc6e1f 100644
--- a/internal/modules/purchases/services/purchase.service.go
+++ b/internal/modules/purchases/services/purchase.service.go
@@ -255,6 +255,39 @@ func (s *purchaseService) GetOne(c *fiber.Ctx, id uint) (*entity.Purchase, error
 	if err := s.attachLatestApproval(c.Context(), purchase); err != nil {
 		s.Log.Warnf("Unable to attach latest approval for purchase %d: %+v", id, err)
 	}
+	if len(purchase.Items) > 0 {
+		itemIDs := make([]uint, 0, len(purchase.Items))
+		for i := range purchase.Items {
+			if purchase.Items[i].Id == 0 {
+				continue
+			}
+			itemIDs = append(itemIDs, purchase.Items[i].Id)
+		}
+		if len(itemIDs) > 0 {
+			var usedIDs []uint
+			if err := s.PurchaseRepo.DB().WithContext(c.Context()).
+				Model(&entity.StockAllocation{}).
+				Distinct("stockable_id").
+				Where("stockable_type = ? AND stockable_id IN ? AND usable_type = ? AND status IN ?",
+					fifo.StockableKeyPurchaseItems.String(),
+					itemIDs,
+					fifo.UsableKeyProjectChickin.String(),
+					[]string{entity.StockAllocationStatusActive, entity.StockAllocationStatusPending},
+				).
+				Pluck("stockable_id", &usedIDs).Error; err != nil {
+				return nil, err
+			}
+			usedSet := make(map[uint]struct{}, len(usedIDs))
+			for _, id := range usedIDs {
+				usedSet[id] = struct{}{}
+			}
+			for i := range purchase.Items {
+				if _, ok := usedSet[purchase.Items[i].Id]; ok {
+					purchase.Items[i].HasChickin = true
+				}
+			}
+		}
+	}
 	s.applyTravelDocumentURLs(c.Context(), purchase)
 
 	return purchase, nil
@@ -498,6 +531,54 @@ func (s *purchaseService) ApproveStaffPurchase(c *fiber.Ctx, id uint, req *valid
 		return nil, utils.BadRequest("Items must not be empty for staff approval")
 	}
 
+	if action == entity.ApprovalActionApproved {
+		itemIDs := make([]uint, 0, len(purchase.Items))
+		itemByID := make(map[uint]entity.PurchaseItem, len(purchase.Items))
+		for i := range purchase.Items {
+			if purchase.Items[i].Id == 0 {
+				continue
+			}
+			itemIDs = append(itemIDs, purchase.Items[i].Id)
+			itemByID[purchase.Items[i].Id] = purchase.Items[i]
+		}
+		if len(itemIDs) > 0 {
+			var usedIDs []uint
+			if err := s.PurchaseRepo.DB().WithContext(ctx).
+				Model(&entity.StockAllocation{}).
+				Distinct("stockable_id").
+				Where("stockable_type = ? AND stockable_id IN ? AND usable_type = ? AND status IN ?",
+					fifo.StockableKeyPurchaseItems.String(),
+					itemIDs,
+					fifo.UsableKeyProjectChickin.String(),
+					[]string{entity.StockAllocationStatusActive, entity.StockAllocationStatusPending},
+				).
+				Pluck("stockable_id", &usedIDs).Error; err != nil {
+				return nil, err
+			}
+			if len(usedIDs) > 0 {
+				usedSet := make(map[uint]struct{}, len(usedIDs))
+				for _, id := range usedIDs {
+					usedSet[id] = struct{}{}
+				}
+				for _, payload := range req.Items {
+					if payload.PurchaseItemID == 0 || payload.Qty == nil {
+						continue
+					}
+					if _, used := usedSet[payload.PurchaseItemID]; !used {
+						continue
+					}
+					item, ok := itemByID[payload.PurchaseItemID]
+					if !ok {
+						continue
+					}
+					if *payload.Qty != item.SubQty {
+						return nil, utils.BadRequest("Purchase sudah chickin, qty tidak bisa diubah")
+					}
+				}
+			}
+		}
+	}
+
 	payload, err := s.buildStaffAdjustmentPayload(c.Context(), purchase, req, syncReceiving)
 	if err != nil {
 		return nil, err
@@ -745,6 +826,54 @@ func (s *purchaseService) ReceiveProducts(c *fiber.Ctx, id uint, req *validation
 			req.Items[idx].TravelDocumentPath = &uploadedURL
 		}
 	}
+	if action == entity.ApprovalActionApproved {
+		itemIDs := make([]uint, 0, len(purchase.Items))
+		itemByID := make(map[uint]entity.PurchaseItem, len(purchase.Items))
+		for i := range purchase.Items {
+			if purchase.Items[i].Id == 0 {
+				continue
+			}
+			itemIDs = append(itemIDs, purchase.Items[i].Id)
+			itemByID[purchase.Items[i].Id] = purchase.Items[i]
+		}
+		if len(itemIDs) > 0 {
+			var usedIDs []uint
+			if err := s.PurchaseRepo.DB().WithContext(ctx).
+				Model(&entity.StockAllocation{}).
+				Distinct("stockable_id").
+				Where("stockable_type = ? AND stockable_id IN ? AND usable_type = ? AND status IN ?",
+					fifo.StockableKeyPurchaseItems.String(),
+					itemIDs,
+					fifo.UsableKeyProjectChickin.String(),
+					[]string{entity.StockAllocationStatusActive, entity.StockAllocationStatusPending},
+				).
+				Pluck("stockable_id", &usedIDs).Error; err != nil {
+				return nil, err
+			}
+			if len(usedIDs) > 0 {
+				usedSet := make(map[uint]struct{}, len(usedIDs))
+				for _, id := range usedIDs {
+					usedSet[id] = struct{}{}
+				}
+				for _, payload := range req.Items {
+					if _, used := usedSet[payload.PurchaseItemID]; !used {
+						continue
+					}
+					item, ok := itemByID[payload.PurchaseItemID]
+					if !ok {
+						continue
+					}
+					receivedQty := item.SubQty
+					if payload.ReceivedQty != nil {
+						receivedQty = *payload.ReceivedQty
+					}
+					if receivedQty != item.TotalQty {
+						return nil, utils.BadRequest("Purchase sudah chickin, qty penerimaan tidak bisa diubah")
+					}
+				}
+			}
+		}
+	}
 
 	itemMap := make(map[uint]*entity.PurchaseItem, len(purchase.Items))
 	for i := range purchase.Items {
@@ -1367,6 +1496,30 @@ func (s *purchaseService) DeletePurchase(c *fiber.Ctx, id uint) error {
 	}
 
 	transactionErr := s.PurchaseRepo.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		itemIDs := make([]uint, 0, len(itemsToDelete))
+		for _, item := range itemsToDelete {
+			if item.Id == 0 {
+				continue
+			}
+			itemIDs = append(itemIDs, item.Id)
+		}
+		if len(itemIDs) > 0 {
+			var count int64
+			if err := tx.Model(&entity.StockAllocation{}).
+				Where("stockable_type = ? AND stockable_id IN ? AND usable_type = ? AND status IN ?",
+					fifo.StockableKeyPurchaseItems.String(),
+					itemIDs,
+					fifo.UsableKeyProjectChickin.String(),
+					[]string{entity.StockAllocationStatusActive, entity.StockAllocationStatusPending},
+				).
+				Count(&count).Error; err != nil {
+				return err
+			}
+			if count > 0 {
+				return utils.BadRequest("Purchase already chickin, failed to delete purchase")
+			}
+		}
+
 		if err := s.rollbackPurchaseStock(ctx, tx, itemsToDelete, note, actorID); err != nil {
 			return err
 		}
@@ -1383,6 +1536,10 @@ func (s *purchaseService) DeletePurchase(c *fiber.Ctx, id uint) error {
 		return nil
 	})
 	if transactionErr != nil {
+		var fe *fiber.Error
+		if errors.As(transactionErr, &fe) {
+			return fe
+		}
 		if errors.Is(transactionErr, gorm.ErrRecordNotFound) {
 			return utils.NotFound("Purchase not found")
 		}