3309733 - "The requested quota amount change cannot be lower than the consumed quota" error when trying to remove a quota in SAP BTP

While trying to remove entitlements from your subaccount, you get the message: 
"We were unable to save your changes.
If you are trying to decrease or remove quotas, make sure that these quotas are not in use.
If the problem persists please open a support incident.

Reason: Failed to update quota in remote provisioning due to: The requested quota amount change [0] is lower than the currently consumed quota [1]. The requested quota amount change cannot be lower than the consumed quota"

SAP Business Technology Platform

Reason: Failed to update quota in remote provisioning due to: The requested quota amount change [0] is lower than the currently consumed quota [1]. The requested quota amount change cannot be lower than the consumed quota, remove, removal, delete, deletion, entitlement, instances and subscription. SAP BTP, Business Technology Platform , KBA , BC-NEO-CIS , Commercial Infrastructure , Problem