Hi Kubra
If you are checking for any impact of Change in Customer Name on the Accounting, Credit Management and ETC (Estimate To Complete) process, then such change will not have any impact except for output forms/print outs wherever name of the customer is printing.
For instance -
Accounting Entry printouts will have New Customer Name
Credit Management Correspondences will have New Customer Name in place of Old Customer Name.
ETC cycle will be untouched. Forms/Printouts will have the new party name.
Note - Changing the name of the customer will change for all company codes in your Org. Structure so you have to assess the impact accordingly if all Company Code owners are agreeing to show their respective printouts with new name.
Hope it helps.
Regards