Your document's LINK field is corrupt.

It contains:
{ LINK Excel.SheetMacroEnabled.12 "C:\\Users\\GMF\\Documents\\Workstation\\Audit Modules\\ΠΡΟΓΡΑΜΜΑ ΕΚΘΕΣΗΣ\\IPPOKRATIS\\ΔΕΔΟΜΕΝΑ ΕΚΘΕΣΗΣ.xlsm!ΣΥΝΟΠΤΙΚΑ!R253C2:R255C12" "" \p }

It should contain:
{ LINK Excel.SheetMacroEnabled.12 "C:\\Users\\GMF\\Documents\\Workstation\\Audit Modules\\ΠΡΟΓΡΑΜΜΑ ΕΚΘΕΣΗΣ\\IPPOKRATIS\\ΔΕΔΟΜΕΝΑ ΕΚΘΕΣΗΣ.xlsm" "ΣΥΝΟΠΤΙΚΑ!R253C2:R255C12" \p }

In any event, the file named ΔΕΔΟΜΕΝΑ ΕΚΘΕΣΗΣ.xlsm must be located in the same folder as the document for the update to work.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]