Variant &1 of program &2 cannot be imported (see long text)

The variant &v1& is to be imported for the report &v2&. Relevant type
information about the report parameters (SELECT-OPTIONS or PARAMETERS)
was changed extensively since the last time the variant was saved,
meaning that the type or length of certain parameters no longer match or
SELECT-OPTIONS or PARAMETERS were switched.
Some changes were so extensive that the variant cannot be imported
without an explicit update or modification of the variant.

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

Use the report RSVARDOC_NEW to adapt the variant to the current data
format of the report parameters. If this report is not in your system,
use the report RSVARDOC_610.
The validity and completeness of variants implemented in this way should
always be checked, particularly if the variant in question is especially
critical or otherwise important.
It is also possible that a variant can no longer be recovered and in
this case it should be deleted or overwritten.

Error message extract from SAP system. Copyright SAP SE.