Update bilingual file into SDL - ERROR

Dear all,

 

I've been working on a big file the last months and recently received back from my reviewer an updated Word file from the bilingual review feature. 

 

I continued working on the project file after sending my reviewer the file. I'm trying to import the changes but can't. Keeping getting errors such as the one in the screenshot.

 

What is going on here? Is it because the project file is now different from the one I sent out?

If that's it, then how can work around that? It doesn't make sense to have multiple files or to stop working in the file until I have the review back.

Thank you

Sofia