Want to change sort sequence in Suggested Payments Report

SOLVED

The default Suggested Payments Report in Sage200 for Education lists the suppliers in Account ID sequence.

I wish to change this to list them in Supplier NAME order.  I understand that the sequencing is controlled by the Group header/footer which is currently set to PLProposedPayments.PLSupplierAccountID  I cannot find the supplier name field in the PLProposedPayments file so I tried changing the grouping to be on PLSupplierAccounts.SupplierAccountsName but this seemed to make no difference to the sequencing of the report.

any help would be most appreciated