SOP - Amend Goods Despatched to be added to Order Despatches Report

At the moment if you Despatch a SOP you can report on the despatch using Sales Order Processing ; Reports ; Status ; Order Despatches. If you then amend the despatch and re-run this report it says No data for the report. This creates a SOP transaction in Stock History which can not be reconciled to the SOP reports. Our customers would like the Order Despatches report to show amendments to goods despatched as well.