2494403 - FIORI apps are not working

FIORI apps stop working suddenly, without clear reason. When trying to launch any app (E.g. Approve Shopping Cart, Track Shopping Carts, My Shopping carts) an error happens: "Cannot call service with URL: /sap/opu/odata/sap/SRM APPLICATION BEING USED".

Errors below are seen in Chrome browser, when you click F12 - tab Console:

"No service found for namespace , name ****"
"FIORI_USER /IWFND/MED170"

• SRM Fiori app Approve Shopping Carts
• SRM Fiori app Approve Purchase Orders
• Confirm Goods Receipt
• Carry Out Sourcing
• Purchase Order
• Central Purchase Contract
• RFx

fiori, app, srm, shopping cart, approve, confirmation, soco, sourcing cockpit, track, purchase order, po, error, /IWFND/MED170, No service found for namespace /GBSRM/, name CARTAPPROVAL, No service found for namespace , name SRM_CONFIRMATION_SRV, RFx, central contract, my shopping cart, Cannot load meta data for service, Cannot call service with URL , KBA , SRM-FIO-SHP , Fiori UI for Shopping Carts , SRM-FIO-CGS , FIORI UI for Confirmation , SRM-FIO-POR , Fiori UI for Approve Purchase Orders , Problem