How to keep target strings that are already present in *.PO file?

Hello,

when processing a *.PO source file, it seems that the target strings, which this file already includes, have disappeared (as if the goal is to write new strings). Nevertheless, I don't want to translate anything, since the translation has already been done and I'm only supposed to review it and to add some terms into a termbase. Do you have any idea how to keep the original translation unchanged? I'm using Passolo 2016 in Demo version if that makes any difference.

 

Thank you.

 

Best Regards,

 

Jonáš.