Fiori is a collection of applications that are built on top of the SAPUI5 framework and run on SAP HANA. OData (Open Data Protocol) is a web protocol for querying and updating data, and it is used as the data access layer for Fiori applications. OData V2 and V4 are different versions of the protocol, with V4 being the more recent and updated version.
If you have a Fiori app that is built to work with OData V2, but the actual service that you are trying to access is providing data through OData V4, there are a few options you can consider:
1. Upgrade the Fiori app to use OData V4: This would require modifying the app's code to use the new version of the protocol, but it would ensure that the app can take advantage of the latest features and improvements in OData V4.
2. Create a bridge service: This would involve creating an intermediary service that sits between the Fiori app and the actual service, and translates the OData V4 requests and responses to OData V2.
3. Use a third-party adapter: There are third-party adapters available that can translate OData V4 to V2, this could be a simple solution but it depends on the specific scenario and the complexity of the data.
It's important to note that the best approach will depend on the specific requirements of your app and the data that it needs to access, as well as the resources that are available to make the necessary changes.
It's also worth noting that OData V2 is not widely supported anymore, and it's recommended to upgrade to the latest version of OData (V4) It is also recommended to check with SAP support or a consultant before making any changes to your app and service, as there may be other factors to consider.
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