How To Fix TN509 - You cannot reset the queue from import phase '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: TN - Support Package Manager (SPAM) Messages

• Message number: 509

• Message text: You cannot reset the queue from import phase '&1'

What causes this issue?

The queue has been processed up to import phase '&V1&'. This means that
objects or system information have already been imported into your
system.
You cannot reverse this import or correct any errors by resetting the
queue status. If you reimport this queue or a modified queue you risk
causing more errors and inconsistencies that can render your system
unusable.

System Response

The status of the queue is not reset.

How to fix this error?

Correct any errors and continue importing the queue from phase '&V1&'.
If you need help with any errors, contact SAP Support.

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.