Actor Actions: 1. Authenticated staff logs into the system. 2. Staff selects the option to manage stocks. 3. Staff adds new stocks by entering the product details such as name, quantity, price, and GTIN. 4. Staff removes stocks by selecting the product and confirming the removal. 5. Staff generates a barcode with GTIN for a new product.

System Responses: 1. The system verifies the staff’s credentials and grants access to the stock management module. 2. The system displays the current stock list and options to add or remove stocks. 3. The system prompts the staff to enter the product details and validates the GTIN. 4. The system confirms the removal of the selected product and updates the stock list. 5. The system generates a unique barcode with GTIN for the new product and saves it in the database.