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SAP / SAP Mid Level (3 to 8 yrs) Interview questions

Explain the difference between OData V2 and OData V4?

OData V4 is the more recent, standardized-by-OASIS version of the protocol, with a cleaner specification and several improvements over V2, though SAP systems (and existing Fiori apps) still widely use both depending on when they were built and what framework generated the service.

OData V2OData V4
Older, SAP Gateway's traditional default for many years. Newer, OASIS-standardized version; default for RAP-generated services.
Slightly more verbose metadata and payload format. More streamlined payloads, improved batch/query capabilities.
Still very widely used in existing Fiori apps. Increasingly the default for new SAP development (RAP, CAP).

For a mid-level developer, the practical implication is knowing which version a given service uses, since the request/response format and certain query syntax details differ — new RAP-based services typically default to V4, while a lot of existing, older Fiori apps and services still run on V2.

Which OData version is typically the default for new RAP-generated services?
Why does a mid-level developer need to know which OData version a service uses?

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