Mads,
A very warm welcome to Beoworld..
Let me start by saying that no question is a stupid question, you just don't currently have the answer.
The first thing to understand is that the Beo5 can control 3rd party products either DIRECTLY (i.e. not involving the Beovision TV) or by the PUC if your 3rd party product is available in the PUC library.
Your Philips DVDR3460 is NOT currently quoted in the PUC library, but as it uses RC5 protocol it is almost certain that other Philips units will work for the most common commands at least.
The PUC is loaded/updated in your Beovision TV with a subset of the library of 3rd party units you are most likely or said you may use and can be changed by your dealer.
B&O's business strategy is to control 3rd party products via the PUC in the Beovision except for non Audio/Video products of business partners such as Lutron. These products are listed under "Other" in the Configuration Tool.
To use your Beo5 directly to control the Philips unit will require an XML file to be created for that product and then you can drag-n-drop it into your configuration using the Beo5 Configuration Tool.