Why is this filter not being applied?

Why are documents inside a folder not showing when a filter is applied?

• I added a custom column called Project (string) to a Document List. I then set different views in different pages to filter on that column. The problem is that, when applying the filter, documents stored inside folders are not shown even if the value of the Project column corresponds to the one set in the filter. Do you know how to solve this problem?

• Answer:

  Based on your last comment I create a webpart to show the Document List on a certain page, and then I applied a filter on a column content to show only certain documents. But in that way the folder structure is lost and all documents are shown flat. I think I can answer your your question now. If you create a new view and select in the filter section Content Type Equals Folder OR And then add the additional condition you wish to apply to the documents. In this way folders will always be displayed but their contents will be filtered based on the additional constraint. This will cause folders to be displayed whether or not they contain any children matching the additional constraint but you will be able to navigate the hierarchy.