Condition record (item data) missing (internal error)

What causes this issue?

The system was unable to read a condition record (item data) with the
(internal) number &V1& from an internal table.
The error occurred in function module &V2&.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

The problem may be due to one of the following reasons:
faulty call of function module &V2& with invalid or inconsistent data
database error, that is, the condition record does not exist in the
database table (KONP)

System Response

How to fix this error?

Contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.