How to find exp date deviation in same column for same Posting date

Hi,

I have a issue like -

I want to find deviation in last column for same Material Number, Same Batch , Same posting date and to find if there is any difference in Exp Date which is last column in the figure.

1. for same posting date -  If 2nd row Exp date is less than the first row exp date.

Then that row should be found.

can anyone help me out is there any logic in Graphical calculation view.

Thanks,

GnR