By default the system property glide.ui.advanced is set to false. In order to show the save button when inserting a record even when the property is set to false, a custom Save UI Action may be created on these tables with action name 'sysverb_update_and_stay':
When the administrator goes to enable the property glide.ui.advanced, users will see two save form buttons when inserting a record in any of those tables, as the custom Save UI Actiondoes not override the OOB one.
Steps to Reproduce
1. Go to the insert form for resource plan. You will see a save form button on the bottom left.
2. Enable the system property glide.ui.advanced setting its value to true.
3. Go back to the insert form of resource plan. You will see two save form buttons on the buttom left.
Note: for task derivative tables such as [pm_project], both system properties glide.ui.task.insert and glide.ui.advanced need to be set to true.
This problem is fixed in all currently supported releases. Review the Fixed In section to determine the latest version with a permanent fix your instance can be upgraded to.
Related Problem: PRB1256926