FIX: In customer order when changing VAT for all items the change is not executed if VAT = 0% #16487
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In customer order when changing VAT for all items it runs OK for any VAT except VAT= 0%. In that case the change is not executed.
The reason the updated is not executed is realted to an IF clause that evaluates the value of input "vatforalllines" that contains the numerical value for new VAT. When VAT is 0% this is interpreted as FALSE so the update is not fired.
There are 3 conditions on the mentioned IF clause:
$action == 'addline' && GETPOST('submitforalllines', 'alpha') && GETPOST('vatforalllines', 'alpha')
If fix #16485 (related to same portion of the code) is applied then "submitforalllines" would only exist when chaging VAT for all items and will allow to remove GETPOST('vatforalllines', 'alpha') from the IF clause.
FIX to #16486