I get the following error message and can't find a way around it:

Cannot add this table: it belongs to database d:\mydb\data\mydb.dbc.

This happens when I choose the Add button inside the Project Window and then I choose a specific file, mytable.dbf, from inside a specific folder, d:\mydb\data, to add to the Tables listing inside the Project Window underneath the Data pagetab.

When I try to REMOVE TABLE to free the table, mytable.dbf, I get the following error message:

Cannot find object mytable in the database.

How can I get around this problem?
Somehow the table thinks it already belongs to the database I am trying to add it to, but I can't add it back into the project window where I will be able to browse the table and modify it.

Thanks for your help.