[Koha] Custom Check-out warning

[Mike D.]

Hello,
our patrons very often want to check if selected books they already read. I
found some warning messages at check-out but sililar is only for renew of
actually checked-out documents. I know that is possible to check this in
patron history but warning message is better solution for our library
because our current system has this feature. Is here some way to patch Koha
for this feature? Warning can look similar as show attached file.

Thank You for help.


Mike