EMIGALL - Historical reads checking schedule records dates

Hello,

We are facing a problems migrating historical meter reads into SAP system. The system is checking schedule record dates and giving errors like  'Entry of MR results not possible' or 'No MR orders created for device &1'. I know that we need to have schedule records to migrate meter reads into SAP system but not sure why EMIGALL checking the schedule record "dates" for historical reads? What are we missing? Can someone help.

Thanks