HI
Sometimes it will show this type of errors when the idocs/luw's get stuck in any one of the system.
please check the job status whether it got finished or is in still active. if the job is still running than the excepted time then check for the amount of the the data it is bring from ECC and do further investigation on the load ie.. sever response...
if the job got finished but some of the data packets are in yellow then change the over all status red in in the monitor screen then in the same monitor screen (ie.. tcode rsmo) select EDIT tab ----> int update -----> setting for further update -----> update/reversal------>read everything manually then right click on the each data packet which are in red then execute the job in background (execute few data packets at a time )and check the status in sm37 tcode(background jobs monitor) .once all the data packets successfully executed then change the status back to normal.
thanks