For future reference:
The problem comes because dual prices/wholesale pricing adds a field to the attributes table.
admin/includes/functions/general.php
after line 1914 ish:
Code:
'" . $products_copy_from->fields['options_values_price'] . "',
add:
Code:
'" . $products_copy_from->fields['options_values_price_w'] . "',
after line 1943 ish:
Code:
options_values_price='" . $products_copy_from->fields['options_values_price'] . "',
add:
Code:
options_values_price_w='" . $products_copy_from->fields['options_values_price_w'] . "',
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