Geln,
Then this clearly indicates that IDOC is not recived in the PI System.
However my Question
Can you please specify what is your sender system here ?
Still remains unanswered 
.
Anyways you need to check for the stuck entries in sender system only, once it is recived in PI System you will able to search the IDOC with the IDOC number along with mentioning the correct date time range in IDX5 tcode.
Good luck!!
Vj