Bug 34146: Counterpart for serials-edit

Bug 34146: Counterpart for serials-edit

Not only additem suffers from it. We can do the same with serials-edit.
This patch adds a server-side and client-side check as we did for additem.

Test plan:
Receive serial with adding items.
Try to add more than 999 items in number of copies.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit f88d2e7983a8962e6c7de424dee7cc20200f2c74)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>