How to extend Task Transaction dates automatically based on PA Transaction Expenditure Item Dates

We have many external systems that generates PA costs. One of them is iSupplier where an AP Invoices can be generated for POs. For Invoices created from iSupplier, the Expenditure Item date validation vis-a-vis Task dates are not validated. This causes us issue during import of Supplier Invoices to PA.Transactions get stuck in the Interface. This leads to manual extension of Task End dates.

My query - any automated way of extending Task End Dates based on Transactions like above.

I thought of using Automatically Update Task Transaction Date, but this needs data to be manually entered in Actual/Scheduled Date (Which is by itself a manual work) and hence not feasible.