Hide GL fields supporting multi-payer feature

This enhancement hides the General ledger fields (payer invoice, payer type and project ID) which support the multi-payer feature and makes them read-only. Therefore, they can no longer be added to the voucher transaction screen, as shown in the screenshot below. The fields were intended to transfer data from their originating record to the customer transaction and should not have been available to the end user.

_Project management and accounting > project invoices > project invoices > Related information >insert column _