Hi Deanne,
The Customer Maintenance window data is stored in the RM00101 table and the Customer Address Maintenance window data is stored in the RM00102 table hence the reason there is a possibility that the Salesperson ID fields can be different regardless if it is for the same Customer ID.
Currently there is no way that the changes you make in one window will roll over to the other.
Best thing you can do is use SQL scripts to update the salesperson id field of the RM00102 to match the RM00101 value.