After i made a product/service item with its related income account, i post its related invoices and found that it is not affect the related income account

Let's trace the posting account of your invoice, mana-cupo-gmail-.

Since you're sure that you've assigned the correct Income account to your item, I would assume that when you use the item on an invoice, your invoice will post to that account. You can check that by opening the Transaction journal, as shown in the screenshot. It would also be a good idea if you can double-check the assigned account.

On the other hand, if you're running the Profit and Loss Detail report and are expecting to see the invoice under the assigned income account, your report should be on an Accrual basis. If the report is currently on a Cash basis, the invoice will only be reported to it when it's paid. See more info about these reporting methods.

Please don't hesitate to reach back out if you have more questions regarding the posting accounts of your invoice.