Segment versions could not be read

What causes this issue?

The segment versions could not be read for the Basis IDoc type '&v1&'
and the enhancement '&v2&' for the port '&v3&', when loading the
structure information.
A possible reason for this is that the function module RFC_READ_TABLE
in the system from which the structure information should be loaded, is
not RFC-enabled.
The logical destination '&v4&' was used to log on to the system.

System Response

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

How to fix this error?

Use transaction IDX2 to display the segment versions, and then the
report IDXVERSIONEN to maintain them.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.