Only values 1 or 3 are allowed for this order

What causes this issue?

When creating an ETM-relevant internal order, you attempted to enter a
value other than:
1 = ETM-relevant with ETM posting rules
3 = ETM-relevant company code to company code (EDI)
Only these values are valid for ETM-relevant internal orders.
You cannot change the order type level, for example, from internal to
external here.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Enter one of the above values or create a new order with an order type
that has the required attributes.

Error message extract from SAP system. Copyright SAP SE.