BGP Advertising issue with single prefix

Hello,

I have to set BGP on my Fortigate 600E appliance with my isp.

I already configured neighbors, AS and advertised routes and everything is working fine except:

There's 1 network in my routing table which is 10.10.0.0/16

I have to advertise to my neighbor only the 10.10.60.0/24 network and not the whole /16 subnet (he set it in his prefix filter) so

I added another static route of 10.10.60.0/24 for my local routing table with the same gateway as the 10.10.0.0/16 has, and advertised it to my BGP Neighbor.

Now, my neighbor gets all the networks I advertise except the 10.10.60.0/24

Routing table (only the routes assosiated with that issue) : 

S 10.10.0.0/16 [1/0] via 15.15.15.1, port5, [0/50] S 10.10.60.0/24 [10/0] via 15.15.15.1, port5

BGP Advertise to neighbor (get router info bgp neighbors <ip address of neighbor> advertised-routes):

*> 10.10.60.0/24   93.52.12.2                  100  32768        0 i <-/->

I dont see what is the problem.. I can see I have it in my local routing table and advertise the network but they still cant get it.

Appreciate any help! 

Thanks