Changing A Configuration
Because meter configurations are effective-dated, you have to deal with the difference between correcting an incorrect configuration and introducing a new configuration.
• You correct a configuration if you entered some part of the information about the configuration in error (e.g. a five-digit register is recorded as having four digits).
• You introduce a new configuration when you reconfigure the meter. All of the existing information was accurate at the time it was entered, but now something about the meter's configuration has changed. The historical information is retained intact, and the new configuration has its own unique identity on the system.
You are allowed to correct an historical configuration, but be careful. You see, meter reads reference a configuration and its registers. If you change an historical register's unit of measure, you are changing the unit of measure of all of the meter reads associated with this register - past and future. This system allows you to do this, just be aware of what you're doing.
You cannot introduce a configuration while the meter is installed at a service point (i.e., the effective date of the configuration cannot overlap with the effective date period of any SP Installation History). Think about it, you can't reconfigure the meter while it's measuring consumption. To reconfigure a meter after it's been installed at a service point:
• Remove the meter from the service point using SP / Meter Installation. To do this, you'll be required to specify a meter read showing how the registers looked when the meter was removed (and you can do this from this page).
• Next, add a new meter configuration using Meter Configuration Maintenance effective on the reconfiguration date. Specify how the registers look after reconfiguration on the new configuration.
• If you need to reinstall the meter at the service point, return to SP / Meter Installation and add a new installation. To do this, you'll be required to specify a meter read showing how the registers look at installation time (and you can do this from this page). As you know, the registers are typically reset at installation, but we haven't made this assumption in the system.
Note: 
Field activities simplify life. Rather than remembering the steps necessary to perform a meter reconfiguration on an installed meter, you should have a field activity type set up with the three steps. If such an activity type exists, you simply create a field activity referencing this type and when you complete it, you can do the three steps all at once.