Hi,
For opening balance of cheques without invoice, the cleanest way is through the General Journal, not the Purchase journal.
Create a line with Account Type Vendor (or Customer), the Account No., Document Type Payment, Document No. the original cheque number, and the amount. On the balancing side, use a temporary account like Opening Balance Equity or a Bank Suspense, depending what your accountant prefers for the migration. Post it
After posting, the entry sits as an open Vendor Ledger Entry of type Payment, ready to be applied later when the matching invoice comes in, or left open if the cheque had no invoice behind it
For cheques issued last year but not yet cleared, remember also to record them on the Bank Account Reconciliation as outstanding, otherwise the bank balance will not reconcile
If the previous year is closed, check Allow Posting From and To on General Ledger Setup, this can block the entry. Either open the period for a moment or post on the first day of the new fiscal year and adjust the equity side after.
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Regards
Gregory Mavrogeorgis