Database object for table & is inconsistent

What causes this issue?

Inconsistencies between the database object and the runtime object of
the table were found when you checked the database object for the table
to be converted. You therefore cannot correctly access the database
table. You cannot convert the table in this status.

How to fix this error?

Using Transaction SE11 (Extras->Database object-> Check) determine the
type of inconsistency and correct it. Then activate the table again and
execute the conversion.

Error message extract from SAP system. Copyright SAP SE.