I have to aplly a custom fee if in the cart there's a product with a certain value for a field (producs with particular kind of battery). I use Commerce fees for applying the fee.
Every time the cart is updated I have to check: if there is at least one of those products the fee is applyed; if there's not (or there's not anymore) I have to not apply or remove the fee.
Removing a fee is a problem, as the module doesn't allow this. But the bigger problem is whith rules: in conditions I can look for a particular SKU (only one) or a particular content type; instead I have to check something like this: "if there's in cart at least one product whith the value 1 for the field_battery,..."
Field_battery is a boolean field thath allow to the store's owner to flag products whith particulr battery, that require the extra fee.
I'm trying with the event "After updating an existing ordine commerce" btu I need help for conditions...