Message type: E = Error
Message class: FTGL -
Message number: 054
Message text: Activation of feature toggles is currently locked by an upgrade.
You tried to activate or deactivate a feature toggle. But this is
currently not possible because an upgrade is running in parallel.
The activation status of the feature toggle was not changed.
Wait until the upgrade finished and repeat your activation afterwards.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.