Managing books from UK public library

[Kevan]

Hi,

My local library allows me to borrow epub books which is great. I have been downloading them into the Sony Reader software and hence to the reader.

When I look on the Reader (PRS-600) they appear under a collection called Purchased with a small clock outline and the number of loan days left.

I use Calibre for all the rest of my ebook management and notice that it does not recognise this collection and on update "loses" it leaving me to search for the books.

Does anyone know how to get Calibre to just leave the Purchased collection as is? I'm happy to return and check out library books via the Reader software, poor though it is.