Rules Engine Plugin not updating fields that are not on the Product selector
As per the current design, the field you are trying to update via rules engine plugin should be present in the Edit Products page (Display charge fieldset).
As a workaround, you can create a custom field set on the Quote Rate Plan charge and add the field that you want to update from the Rules engine.
Then add the field set to the Whitelist FieldSet Name in Quote configuration settings. This way we can hide the field from the product selector but still update it from the Quote Rules Engine Plugin.
Please review the below Knowledge Article for more details on how to add the field to Whitelist FieldSet and how it works.
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