Unit Price from Change Order is not pulling into invoice after run project billing is done

Hi All,

This is the billing rule formula I am using to pull in my project billing which is T&M. It’s excluding a project task which is fine. However, when I do a change order to the revenue budget in the project, after running project billing the line item that has a change order is pulling in a 0 dollar value to the invoice. How can I modify my billing rule to pull the correct unit price for the change order? Any guidance would be appreciated

T&M Billing Rule Formula: 

  =IIf([PMTask.TaskCD]='MAT', 0, [PMTran.Qty] * [PMTran.UnitRate])

Thanks,

Frances