Hi Treasure,
When you print/email invoices in Order Entry, do you have 'Use Selected Spec', 'Use Document Spec' or 'Use Current Customer Spec' as the Specification option? This will indicate which spec is used.
The specification drop-down field will read the defined invoice spec from File / Workstation Options. If the 'customer spec' setting is chosen, then the above spec will be ignored if the customer has a special spec defined. The drop-down field will not get replaced by the customer spec value if you use the Customer Spec option, if that was what you were expecting.
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Regards,
Softrak Tech Support