broken link popup message error

A few months ago in a long test file writer I think I have created at least two links between portions of the file and respectively a table and a query from another test database, but I don’t remember where anymore.
Since then I believe I have deleted, or modified or deleted the database, losing the links between the database and the test file.

Today, opening the test writer file, pop up information boxes open continuously with messages such as “” There exists no table named … ".
In the menus I see no way to see the links and which portion of the file they refer to.

In the future I would like to use these techniques on working files, not only on test files, and therefore I must be able to solve these problems.

What can I do to locate / edit / delete links and locate where are the targets of the links in the writer file?

I have verified another anomaly. Opening any other file writer, even new, after about ten minutes from its opening, the popup messages I mentioned in the opening post of this discussion start to open.
And the frequency with which they open is important, every ten to twenty seconds, but with moments in which they open in pairs spaced a couple of seconds apart.
The new file I’m working on is a test file in writer on the fields.