PayloadName tab missing under Inbound Message in SXMB_MONI

Hi,

I am using SAP PI 7.1. In SXMB_MONI, under Inbound Message -> Payloads tab, I can see MainDocument (application/xml).

But I want to view Inbound Message -> Payloads -> PayloadName (text/xml). Previously I was able to see PayloadName, but then suddenly from yesterday, it's missing. Whatever I do, I am still not able to see the PayloadName tab.

Please help me out.

Thanks,

Sowmya