Yes, the GP1 I/O board needs to be listed in position 1 on the I/O Board to Serial Number Mapping for Telect's IOE controller.  You can confirm it is listed in the first position by comparing the I/O board serial number for the board in position 1 to the registered serial number for the GP1 board in the RxP Device section.

If this is not the case, you need to enter the correct serial number for the GP1 board into position 1.  If the GP1 board is not listed in position 1, the Low-Voltage-Disconnect functionality will not operate properly.