I had a problem (which really wasn't one 
) but it leads me to the question how could i delete/avoid multiple IPTC Records. For several reason i have to work with multiple Software for editing my Metadata i also often have to chance my Metadata but nevertheless i really don't like multiple Records so how can i erase the old Metadata then i applying new one?
What do you mean by multiple records? IPTC vs. XMP? There should only be one of each kind in any given file.
Fotostation used to (and may still do so) write IPTC in a non-standard location so it is possible to have two IPTC records in a single JPEG file.
What file type are you working with?
-Kirk
