What Start Date to use with Create General Ledger Balances Cube process?

Summary:

We don't know what Start Date to use with Create General Ledger Balances Cube process

Content (please ensure you mask any confidential information):

We had a T2T ERP refresh and were instructed by Oracle Support to run the Create General Ledger Balances Cube process to resolve a data load issue. The Chart of Accounts and Accounting Calendar parameters are easy to determine (we only have one of each), but we do not know what do choose for Start Date parameter. There is nothing in any literature I can find, all it says is "set the parameter." Do we choose the current accounting period? The oldest period in the ERP? Something else? What are the implications of choosing one date vs. another? We have