Inbound delivery &1 is not deleted yet; Cancellation not possible

What causes this issue?

The outbound delivery is part of a 2-step stock transfer. The goods
issue cannot be cancelled until the following inbound delivery &V1& has
been deleted.

System Response

It is not possible to cancel the goods issue.

How to fix this error?

Call the <DS:TRAN.VL32N>change transaction</> for the inbound delivery
&V1& and delete the document.
If the inbound delivery contains handling units, they must first be
deleted if Handling Unit Management is not active in your system. If
Handling Unit Management is active, you must undo the assignment of the
handling units to the inbound delivery in the packing transaction before
the document can be deleted. In this step, the handling units are
reassigned to the previous outbound delivery.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.