Turning on 'use default price' discards any values entered in the same save
Learn what happens to entered values, formulas and channel-specific settings when you turn on the link to the default price.
Saving with the option off writes the entered values and detaches the channel from the default.
If the channel never had its own saved price and a user saves it with the option enabled, nothing is stored at all — the save still reports success because the channel already follows the default.
Inheritance is all-or-nothing: you cannot follow the default price while keeping a channel-specific tax or margin, because enabling the link makes tax, margin, discounts and display unit come from the default record too.
A channel can instead be set to calculate its price from a formula; that option cannot be combined with following the default, and turning the link on clears any formula previously set for the channel.