Internal Table related query

Hi Guys,

I have a 1st Internal Table with all shipments details.

I have 2nd internal table shipments details along with pallets details.

My 2nd Internal table looks like below.

PN TKNUM

1 1144

2 1144 and many more than this

3 1145

4 1145

I need to calculate that TKNUM 1144 has total 2 PN's and TKNUM 1145 has total 2 PN's

Thanks,

Prasad.