Action not possible because PSA is currently being transferred

What causes this issue?

Persistent Staging Area &V1& is part of the object list of a BW4HANA
transfer that is currently running. The system prevents any changes
being made to this Persistent Staging Area so that the transfer can run
correctly.

System Response

The action has not been carried out.

How to fix this error?

In the case of an "Inplace" BW4HANA transfer, the action is likely to
remain impossible, because the persistent staging area will no longer
exist after the BW4HANA transfer. In some cases, persistent staging
areas are transferred to DataStore objects (advanced). It might then be
possible to do some corresponding action on this DataStore object
(advanced) after the BW4HANA transfer.
In the case of a remote BW4HANA transfer, repeat the action after the
BW4HANA transfer has finished.

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.