ARRAY op error: DB table=&1, op=&2, rc=&3, lines=&4

What causes this issue?

While data was being saved in the SAP system database, a DB error was
detected on table &V1& for 'array' operation type &V2&.
Operation key:
'H' = Insert
'V' = Change
'L' = Delete
Return code &V3& was issued. The number of array lines processed at
the point of error was &V4&.

System Response

After detection of the error, the following occurred:
Changes already made to the database during the current saving process
were cancelled
The change to the database which caused the error was cancelled
Any changes still to be carried out during the current saving process
were cancelled.

How to fix this error?

Contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.