Bug 23018: Refunding a lost item fee may trigger error if any fee has been written...

Bug 23018: Refunding a lost item fee may trigger error if any fee has been written off related to that item

If a lost item fee is written off, it creates a writeoff with the same itemnumber but the amount column is a negative number.

Now, when the lost item is returned, it calls _FixAccountForLostAndReturned which searchs for all accountlines with an account type of 'L' or 'W'.

Then, if the *first* of those lines has an outstanding balance, a credit is created and *all* the lines found are passed to $credit->apply. The apply method then calls is_debit on each line and when it hits the writeoff, it throws an exception ( Koha::Exceptions::Account::IsNotDebit ).

When this happens, the credit is creating but not applied the the outstanding lost item fee, and the librarian is presented with an error page.

It seems like the solution is to only fetch the first result since it seems like that is the only one we should be operating on.

Test Plan:
1) Create a lost item with a fee
2) Create a manual debit using the barcode of the item
3) Write off that manual debit
4) Check in the item, note the error
5) Apply this patch
6) Repeat steps 1-3
7) Check in the item, no error!

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>