Track changes in idml files

We have received some indd files to translate. We build the project and add the files in Trados Studio, but using the file type review an error messages is displayed saying the tracked changes cannot be merged automatically. See image attached) So we can´t add those files to the project. We checked the idml files but there are no tracked changes at all. FUCan you help us with these three Indd Files? We need them converted into IDML but receive an error message that they contain track changes which we have to confirm first but there aren´t any. We have also checked the file type and the box “Process document with changes tracking” is checked as well.

 

Can you help us with such issue?