Rescheduling might show up in how the loan is recorded and affect your credit score, but the impact isn't the same in every case; it depends on the reason for the rescheduling, the loan's status beforehand, and how the lender notifies you.
Steps
If you're a regular customer and considering a preventative rescheduling, ask your bank directly how they will record the loan in iScore.
Most importantly, don't let your payments fall behind without a formal agreement.