Considerations and limitations for iPad devices
Your HATS application may appear or behave differently on iPad devices compared to other mobile devices because of differences such as screen size and web browser. Because the iPad device includes a large screen relative to some other mobile devices, it works better with applications that are not created with options optimized for mobile devices. When creating a HATS web project for an iPad device, do not select the Optimize options for mobile devices option.
For up-to-date support considerations, see "Host Access Transformation Services 10.0 - Known issues and workarounds" at https://www.ibm.com/support/pages/node/7258335.