2562110 - Development function currently not available due to upgrade preparations - Extensibility Applications

• You are trying to use Extensibility Applications, such as Custom Analytical Queries and Custom Business Objects, but the "edit" or "create" buttons are greyed out.
• Some of the Extensibility Apps are triggering the error message: "Development function currently not available due to upgrade preparation."
• Some of the Extensibility Apps are triggering the error message: "Editing is not allowed on this system."
• Application Jobs apps that have jobs scheduled during the upgrade may remain in the Status "Scheduled" with no error

SAP S/4HANA Cloud Public Edition

Upgrade, Custom CDS View, Custom Business Objects, Preparation Prepare, Custom Fields and Logic, Transport, ATO, Export Software Collection, Planned Downtime , KBA , BC-SRV-APS-GKE , Generic CDS Key User Editor , BC-SRV-APS-EXT-SL , Manage and Import Software Collections , BC-SRV-APS-EXT-AQD , Fiori based Query Designer , CEC-MKT-EXT , Marketing extensibility , CA-GTF-EI , Foundation Master Data Services (SAP_COM_0114) , CEC-MKT-BF , Basic Functions , Problem