I have noticed that when I open a table with the code below, it get's reported as not open when I try to access it from a form. Why?

Where is this code located? Is it in the form? Or is it in a .prg that calls the form? If the latter, is the form in a private data session? If so, this is the reason. If the table is opened in a prg (default data session) that calls the form with a private data session, the form cannot "see" the table that was opened by the prg.