GET parameter &2 defined as default value for parameter &1 does not exist

What causes this issue?

A <DS:TX.DDDOK_SHLP_DEFAULT>default value</> was assigned to parameter
&V1& of the search help. The value &V2& that was assigned is not a
literal (since it is not enclosed in apostrophes) and not a system
field (since it does not begin with 'SY' or 'SYST'). It is therefore
interpreted as a <DS:DE.MEMORYID>GET parameter</>. This GET parameter
does not exist.

System Response

The action is continued with a warning or terminated.

How to fix this error?

If the message is output when an imported request is activated, it is
possible that the GET parameter will have been imported with the next
main import. In this case the problem has been solved. Otherwise you
should check the notation of the default.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.