Hi Brus,
The problem is that with AR90A in use, each customer has a 'default OE discount %' that you can set on the Invoicing tab of the customer. However if you override the discount percent on a new order to something different, even though posting the order saves it correctly, re-editing the order reverts the discount to the customer default %.
What needs to change is when editing an existing order to not load the OE default discount % from the customer. Thanks for letting us know what is happening.
In the meantime, if this customer always gets a 10% discount on orders then you could set this value on the customer and thus whenever you edit an order, a value of 10% is used. This may not be an appropriate workaround if a customer gets different discounts for different orders.
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Regards,
Softrak Tech Support