PI IDOC communication failed.

Hi Experts,

I am new to PI. Facing IDOC communication issue in BOBJ system.

suddenly since few days , we are not able to see all the messages through transaction /POSDW/MON0.

messages are appearing for some of the partner names only.

Also in ECC, we05 is displaying none of the outbound IDOCS. before it displays all the IDOCS for inbound and outbound with message type selection.

Can you please help me to rectify the issue. Where I need to check for the root cause.

BR-Manoj.