Hi
We can manually update & Extract the RG1 Register by using the Transaction Code : J1I5 and J2I5
Menu Path: IMG-->Logistics - General-->Tax on Goods Movements-->INDIA-->Business Transactions-->Incoming Excise Invoices-->Specify Which Movement Types Involve Excise Invoices
In the above path we can update the movement type wise corresponding Excise registers and the same movement type system will consider while update & extract the RG1 Register