Technically cannot. ST requires a RCCB 30 mA for 13 A sockets. Your DB should have 2 RCCBs, the 30 mA one feeding all the sockets and appliances, and a 100 mA one feeding all the lighting.
-BUT- you could have one RCCB 30 mA feeding everything, as ST specifications say MAXIMUM rating of the RCCB. So using a 30 mA for lighting does not exceed the 100 mA specification.
Actually, ST recommends using 3 x RCCB, one for each phase-neutral pair for residential applications. This is because you may be 3 phase, but you are actually 3 single phase for residential.

As for ST guideline:
MCB 16A for 1x 13A socket
MCB 20A for 2x 13A socket
MCB 32A for 4x 13A socket
MCB 32A for 6x 13A socket in ring configuration.

The rating of the MCB depends on the size of the wire that is used, not the number of sockets connected to the MCB. For C32, the wires would have to be a minimum of 4 mm², or a ring circuit with 2.5 mm². I've asked Zot for the source of his information so I can restudy it and correct myself if I am wrong. Stay tuned once he cites the source.

Note that the 6 sockets are in ring configuration. Just in case you are not sure what it means. The ring wiring is when wires come out from DB and go to sockets in series and return back to DB through another path to form a circle. Therefore, if you cut wire to one of the socket, power will still be available on the rest of sockets. My house wiring is like this. There are two separate rings for ground and upper floors. I have 2x32A MCB in my DB.

Just think you MCB is more on protecting wire in wall. If current is too high, the MCB will trip to protect wire in the wall from getting to hot and melt the insulator, short-circuited and ignite fire. The MCB rating is not rated to provide total power to sockets on the wall. As you can see the 20A MCB is used for 2x13A socket. Two sockets totaled up for 26A but the MCB is only 20A.

Current carrying capability of wire depends not only on its size but ambient temperature and how it is laid also affect current rating. I always assume the 4mm wire should be protected by 20A MCB even though it can carry much more current. If in thermally isolated trunking in will be rated at 24A but if laid directly on concrete wall it can go up to 32A. However, you have other wires  put together.This will affect ambient temperature as well.

Hope this helps.