Matchcodes no longer supported (-> Long text)

What causes this issue?

SAP matchcodes are no longer supported as of Basis release 6.10.

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?

Instead of a matchcode, use a database view and, if necessary, a search
help function. The technical details are explained in CSN Note 24860.

Procedure for System Administrators

If you have a matchcode ID of the update type "K" (implementation of F4
help through function module), make sure that the corresponding searc h
help with the same name meets the condition named in the T100 message
DH899. Afterwards, you can delete the matchcode ID without any problems
since it has become superfluous.

Error message extract from SAP system. Copyright SAP SE.