I have a problem with my Production Order, I'm surprised that I can still do Goods Issue or Good Receipt when my Production Order have status Teco. 
Why there are no messages at all when this is happened? 

I would like to share some fact about Production Order status.  

This will help you to decide which status you need to be deactivated in a sequence status number.
 
A status profile is created in customizing per order type.

Within a status profile you can

- Define user statuses and document their function in long texts

- Specify the expected sequence of user statuses by assigning a "status number" to each user status

- Define an initial status, which is automatically set when the object is created

- Specify that a user status should automatically be activated, if a certain business transaction is carried out

- Allow or forbid certain transactions, if a status is active

Now,  for every user status you can define a status number. 

With the help of the status number you determine the sequence in which the user statuses are activated.

If you do not assign a status number to a user status, the user status can always be activated. However, only one user status with a status number can be active at any given time.

If you assign a status number to a user status, you must also specify a lowest and a highest status number for the user status. These limit the status number interval from which the next user status can be selected.
 
Goto BS42 and change the selection condition accordingly.

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