Not sure if this should be split out into separate bugs, but these are all blockers b/c the product doesn't function properly.
Within a "create" maintenance document:
1.) When you add a bunch of collection items from a multi-line lookup, all come back appropriately with delete buttons; however, after you delete the first item in the collection, when the page reloads, the delete buttons for the remaining items go away and there's no way to delete them
2.) If you try to reload the document from a SAVED state, the delete buttons are not there for the collection items
3.) The same goes for sub-collections... though these don't use the multi-line lookup
When "editing" a record using a maintenance document:
1.) There is no way to delete an existing collection item, the delete button doesn't show up
The pattern seems to be that when the post of the page happens, the delete buttons (if there were any) for all previously existing collection items disappear, while the newly added record, if there was one is the only element with the delete button. But if you post the page again for some reason other than for adding a new item to the collection, then all delete buttons disappear for all collection items disappear.