[Koha-bugs] [Bug 30003] When leaving 'Amount Tendered' blank, then filling in a value, two transactions are recorded

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=30003

--- Comment #8 from Jake Deery <jake.deery at ptfs-europe.com> ---
Created attachment 130428
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=130428&action=edit
Bug 30003: Prevent double up of point-of-sale items

This patch prevents the double submission of point-of-sale items when form
validation fails at the first submission

Test plan
1.  Navigate to /cgi-bin/koha/pos/pay.pl
2.  Add an item from 'items to purchase'
3.  Under 'collect payment', click submit without altering the form
4.  See 'This field is required.'
5.  Now, fill a value in 'Amount tendered' that satisfies or exceeds 'Amount
being paid'
6.  The payment should succeed
7.  Navigate to /cgi-bin/koha/pos/register.pl
8.  See duplicate lines in Transactions

Signed-off-by: Sally <sally.healey at cheshiresharedservices.gov.uk>

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