Inventory Holding Cost Rate input into IO optimizer

The Supply Planning team is using the same Inventory Holding Cost Rate key figure using a custom business process for maintaining it as the Inventory Holding Cost Rate used for input into IO. I was wondering is there a way to exclude Inventory Holding Cost as input into IO other than using a different version? We cannot change the process that Supply is using to maintain that field and IO would like to not use Inventory Holding Cost Rate as input to IO. IO would also like to not use a different version but that's the only workaround I can think of.

Thanks,

Melanie