How can we avoid the GR/ GI/ confirmation after the TECO or Order settlement?

After TECO, you can still post the GI or GR and Confirmations on the Orders.

This is a Standard feature of SAP.

To counter this, you can handle this with the following:

Create the user status and assign to the order type. In that you can create the user status TECO and forbid the CNF status. So if you activate your user status TECO to your order it will stop the confirmation.

or

You can control this using transaction BS22,

Select status I0045 TECO Technically completed, double click on this value and then select the radio button for 

RMPH Partially confirm order
RMPO Partially confirm operation
RMRP Incoming invoice
RMRU Confirm order
RMWA Goods Movement
RMWF Goods receipt for prodn. order
RMWI Inventory difference
RMWL Goods issue delivery
SDGI Post goods issue

and select Forbidden to Disallow the above functions, save it.

With this you can restrict GI/GR/Conf. for the Orders.

But these settings are at Client level, so please be careful.

or

Check with this user exit, CONFPP01.

This will help you to meet the requirement, with the help of your ABAP consultant you can achieve this by activating this user Exit.

The system will throw an error message if you try to confirm an order which has the TECO status.

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