Ivana Bojčić 

ok - let's try and work through what you have told us.

Ivana Bojčić said:

Upon creating local project with four trados sdlxliff files (IT-HR)

So you are loading SDLXLIFF files, which are bilingual files, to a new project in Studio.

Ivana Bojčić said:

First I receive the info that the source language is different from the project source language.

The source language in the project you have shown is German.  You said the SDLXLIFF files are Italian.  This is why you get that message.

Thank you, but how do I adjust the correct language when it's set by default?

For example, I open a EN-SL sdlxliff file via Browse and it generates the above mentioned problem saying that the source doesn't match. And I really cannot adjust it to match because it just crashes.

My only workaround was to open one Word file via Browse (this worked) and added my sdlxliff IT-HR files, and then I changed languages to IT-HR and managed to create a project.

Thank you, but how do I adjust the correct language when it's set by default?

For example, I open a EN-SL sdlxliff file via Browse and it generates the above mentioned problem saying that the source doesn't match. And I really cannot adjust it to match because it just crashes.

My only workaround was to open one Word file via Browse (this worked) and added my sdlxliff IT-HR files, and then I changed languages to IT-HR and managed to create a project.

Ivana Bojčić 

If you don't want to have a template that uses IT-HR, or change your default, then just select the language before adding your files.  Do that here:

It's not fixed!  Same for the target languages.  Make sure they are correct too.

I see - I can do it only via Home - New Project, but not via Browse because it just crashes after clicking OK here:

Thanks anyway.

Ivana Bojčić 

Your problem seems to be that you are trying to add a bilingual file, that already has a language set, to a project that has been set up to use different languages.  This is clear from your screenshot (note you can copy and paste images into here... no need to use external links which we don't like, so I replaced it).

If you add sdlxliff files, that already have their languages set, then you must make sure that the project settings match them.  Otherwise, you will always get this problem.  This is entirely a problem of your own making as far as I can see.

I don't really understand what you mean by browse... maybe you mean the drag and drop?  Two solutions to this:

1. Don't use the drag and drop (it is actually slower anyway!), OR
2. Change your default project template so it uses the languages you want

You do that by going to File -> Setup -> Project Templates and in there you can set the languages you want to be default: