AME and OIE Expense Report - Line Level Approver by Project Manager

Any information on how to setup AME for Internet Expense Reports, Line-Level Approval by Project Managers would be appreciated.

I'm aware there is an Oracle Extension available for Header-Level Approval by Project Manager but the business requirement is for Line-Level (where different lines on the expense report can belong to different projects). We have version 12.1.3

Have tried editing an attribute on the OIE Expense Report Transaction Type. The attribute is Line_Item_Starting_Point_Person_ID. Changed the SQL query to use "getProjectApprover" instead of "getLineLevelApprover" and it passes as valid.

However, when we test a real transaction, we get an error that there's a problem with the attribute.