FK01/XK01 Copy with reference not copying across all field data

Hi all

When using transactions FK01 or XK01 to create a new vendor with reference to an existing vendor, fields such as LFB1-TLFNS, LFB1-TLFXS & LFB1-INTAD in the Correspondence tab are not being copied across. However if I use the mass transaction code FK15 then all fields are being copied over to the new vendor. Why is this not the same with FK01 & XK01?

Kind regards

Andre Spruit