Rest API to update Grade on Lot and serial control item

Summary:

Customer looking to update Grade on Lot for Lot serial control item using REST API.

Below API working only when item is Lot controlled. But it is failing when item is both lot and serial control

https://host:port/fscmRestApi/resources/latest/inventoryItemLots/{lotuniqis}

I verified the Documentation, But I don't see any API related to this case.

Please help.

Thanks,

Ravi