PO's Tracking tab does not have entry of invoice

Hi ,

I am working on SRM,

I was able to create invoice sucessfully using 'BBP_PD_INV_CREATE' but i was not able to see Invoice Number  On click of PO's Tracking Tab.

i was able to see Invoice which i created separtly but i was not able to see Invoice Number  On click of PO's Tracking Tab..

What might be issue??

Thanks in Advance