Sometimes we can see where clause, but I can't find out the difference between where and which clause or if it can only use where clause in some specific situations. The sentences below is two examples I met lately, both of them in which I can't understand the inherent grammatical rules or where clause possesses a special meaning:
Financial documents showing that you have sufficient funds available. These must clearly show that you have access to the funds, such as: where a third party (who is either in the UK or who will be legally in the UK at the time of your visit) is providing financial support to you e.g. a business, a friend or a relative, documents to show they have sufficient resources to support.
Details of employment or studies where you have stated in your application that you are either employed or in full-time studies.