Order Import and Ship Confirm validations

[nagul]

Hi all,
I learned financials and OM, INV,PO modules and abt to take the interviews.
But, I am unable to clear as they are asking what additional validations have u done for order import and ship confirm.
Can any one you tell me some of the real time issues that you have faced during the conversion and interface loading and howw u have solved them....Plzzzz

Thanks.