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The benefits are showing in reviewing data in both manaual and ERP to discover if there is mistakes or not.
Revision is an important step in the work to gurantee all data entered is right.
would not be any excess cost invloves maintaining both system?
My dear friend, manual recording of data after go live should be avoided as much as possible and if done it should be carried on only for max1 month as we would have to deploy valuable resources for carrying out this task.
You should do the reconcilitaion betwen manual entries and system enerties on weekends to adjust / correct / rectify any entries in the system if any as you will have the week end time to do this activity.
Tips to save valuable time :
1) Use standard report to do the reconciliation with manual entries
2) Do manual / parallel recording for critical transactions only ( cheque recording, invoices, etc..)
3) Use2nd level core team memebrs to handle these activities
Certainly not. parallel recording systems might be used immediately after the ERP implementation to verify the results but it must be stopped after that becuase it turns up to become total waste of resources.
mistake mayhappen during operating ERP
saving data from any lost
