There is no good way to do this in Sage.  Don't know if there is a way to do it using the SDK.

It probably makes more sense to just make sure your opening balances work, and perhaps keep the 2019 database around labelled 'old - for lookup only'.

The problems with trying to import 2019 entries using the tools Sage provides are:

1. Sage can only accept entries for 2 fiscal years.  Assuming your fiscal year is a calendar year, if you are working in 2021, you can no longer make journal entries into 2019 - whether you are keying them or importing them.

2. While Sage can export all types of journal entries, it can only import general journal entries.  This means that all of your payroll / payables / receivables / inventory quantity entries from 2019 would be imported as general journal entries, which will cause massive data integrity problems if you are using any of these modules.

There is no good way to do this in Sage.  Don't know if there is a way to do it using the SDK.

It probably makes more sense to just make sure your opening balances work, and perhaps keep the 2019 database around labelled 'old - for lookup only'.

The problems with trying to import 2019 entries using the tools Sage provides are:

1. Sage can only accept entries for 2 fiscal years.  Assuming your fiscal year is a calendar year, if you are working in 2021, you can no longer make journal entries into 2019 - whether you are keying them or importing them.

2. While Sage can export all types of journal entries, it can only import general journal entries.  This means that all of your payroll / payables / receivables / inventory quantity entries from 2019 would be imported as general journal entries, which will cause massive data integrity problems if you are using any of these modules.