Error while loading

Hi Guru,s.

I hv connected BW system and R/3 system, but when trying to load data from R/3 to bw with help of generic data source with table.Iam getting erros like this.

If i see the detail tab in monitor screen.

Request:ok.

extraction:missing meassages.

Transfer(IDOC& TRFC:Missing meassages and warning.

Processing:Evrything is ok.

what could the reasons,where we can check inbound Idoc in BW.

Regards.

hari