Idoc entering status 51

Hello ,

This problem is little different . When IDOC is processed it enters status 51 Error:Enter the requested delivery quantity

If we keep break point in respective fn module and reprocess the idoc then it enters status 68 Error : no further processing (

IDD232 - IDOC Archived due to old Timestamp.)

Kindly tell us some solution or some different method to debug and find exact location where it goes to status 51.

Thanks & regards

Poovizhi R