Transaction & not allowed for order &

What causes this issue?

The order status determines which transactions are allowed for this
order. You can also enter a locked transaction group in the order that
locks the order for specific transactions. You can only run a
transaction for an order if the status permits and if the transaction
does not belong to the group of locked transactions.

System Response

Transaction &V1& (&V3&) is not allowed for order &V2&.

How to fix this error?

To perform transaction (&V3&), you must change the status in order &V2&
so that the transaction &V1& (&V3&) is allowed and the order is not
locked for this transaction.

Error message extract from SAP system. Copyright SAP SE.