Refresh,Reread, Research functions in Axapta...

.refresh() will not reread the record from the database.  It basically just
refreshes the screen with whatever is stored in the form cache.

.reread() will only re-read the CURRENT record from the DB so you should not
use it to refresh the form data if you have added/removed records.  It's
often used if you change some values in the current record in some code, and
commit them to the database using .update() on the table, instead of through
the form datasource.  In this case .reread() will make those changes appear
on the form.

.research() will rerun the existing form query against the datasource,
therefore updating the list with new/removed records as well as updating
existing ones.  This will honour any existing filters and sorting on the
form.

.executeQuery() is another useful one.  It should be used if you have
modified the query in your code and need to refresh the form.  It's like
.research() except it takes query changes into account.