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 case.

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, If you are trying to decrease or remove quota, make sure that this quota is not in use. , KBA , BC-NEO-CIS , Commercial Infrastructure , Problem