Stop the Project related fields on a Projects related invoice line of being updatable after the dist

Hi,

How to stop the Project related fields on a Projects related invoice line of being updatable after the distribution line is in Saved mode ?

To reproduce the issue, in E-BS R12.1.3 :

1. With Payables, navigate to Invoices : Entry->Invoices
2. Create invoice header and save.
3. Choose a Project Folder that will allows you to have the Project related fields in the invoice line.
4. Create an invoice line inputing the  Project, Task, Award, Expenditure Type, Expenditure Organization,
5. Save the line.
6. With the above created line selected,  click on the (B) Distributions : the Distribution Class is Preview
7. Close the distribution form and choose to save. Clicking on the (B) Distributions : the Distribution Class is now Saved.