The information structure & cannot be deleted

What causes this issue?

No DDIC tables (Snnn, nnn = 501 to 999) could be determined for
information structure &V1& because no TMC4 table entries are available.

System Response

Information structure &V1& cannot be deleted.

How to fix this error?

The information structure can only be deleted if the DDIC table Snnn is
known. You can then create an entry in the TMC4 table with the
following fields:
TMC4-MCINF = '&V1&'
TMC4-GSTRU = 'Snnn'
Import the transport request again.

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.