Error when inserting in PSA table &

What causes this issue?

An error occurred with the insert into PSA table &V1& for InfoSource
&V2&.

System Response

Your data was not updated in the PSA table.
It is possible that data already exists for this request &v3& and data
packet &v4&.

How to fix this error?

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.