When will spell check be added?
This is not currently on our roadmap for Ariba Contracts at this time. If you would like you can add put in an Enhancement request with all the business information for this feature.
Why isn't it available in SIPM as well? This is a very simple feature and it's not available to clients . As I type this response....it's available above.
The same applies for SPIM. You may add an enhancement request with the details for SPIM.