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It doesn't appear possible currently to add an action to a page that doesn't have any defined already (like 5911 Service Comment Sheet). The only supported syntax is addlast(Anchor), but since there aren't any anchors, it simply can't be done.
STATUS DETAILS
Completed
Comments
Since the Spring '19 release, built-in anchors are synthesized and can be used as anchors. Use IntelliSense/Ctrl+Space in the parentheses of the addlast() keyword to see available options. For, e.g., Service Comment Sheet, you can use Creation, Navigation, Processing or Reporting as anchors for actions.
Category: Development