Not able to update or create the data through oData Services

Hi

I am trying to update or create a entry in bank account under FPP2/3 Transaction through odata services, but I am not able to execute the odata services with both POST/PUT method, facing error like bad request or method not allowed.

I checked in metadata that for all entity showing creatable="false" sap:updatable="false" sap:deletable="false".

Early response will be highly appreciated.

Thanks!