We have a document library inside a SharePoint enterprise server 2013 Team site. and inside this document library we have uploaded some Project plans. where we have master project plans and sub-project plans uploaded inside the document library. now we are facing these issues when we try to update a sub-project from the Master project , where when we try to save the sub-project it will say that the sub-project is Read-only, Here is the full scenario:-
1- we can update a sub-project directly from the project plan, and the changes will automatically update in the master project. which is fine.
2- But when we try to update the sub-project within the master project, the sub-project does not update and when we try to save the changes we will get a message that the sub-project file is "Read only".
so can anyone adivce how we can fix this ? so we will be able to update sub-projects from the master project plan ?