I just found about this MOD for my sister's ZEN CART while looking for a way to post-edit orders when needed (removing shipping fees, removing one item that was supposed to be in stock ... but really wasn't, etc.). We don't have to take care of the taxes, that's good.
I got the blank login screen as well and found out that I alread had a edit_orders.php next to edit_orders_functions.php with exactly the same contents (not sure where I got this one!). PHP was basically trying to redefined functions already defined
I can now login again and edit an existing order: address, put 0 quantity, change shipping, etc. However, if I try to add an product to the existing order, after selecting it from the drop-down menus, all I can get is:
I read the whole thread but can't find someone with the same problem. I am the only one? It's purely within edit_order.php which is a native/original file, not a merged one. Did I forget something?
1364 Field 'products_prid' doesn't have a default value
[insert into orders_products set orders_id = 162, products_id = 288, products_model = '', products_name = 'LeS CraYonS de CouLeuR', products_price = '14.5000', final_price = '14.5', products_tax = '0', products_quantity = 1, onetime_charges = 0;]