Use this whenever the xref has changed during a session (because someone else on a networked system has edited the xref drawing) or after unloading an xref.
To možnost uporabite, če se je zunanji sklic po zadnjem nalaganju spremenil (to se zgodi, če je drug uporabnik v omrežju urejal risbo zunanjega sklica) ali če ste zunanji sklic umaknili.