We have a custom data source and tab page related to sales lines. The users want to have data on that tab page to remain editable after the sales line has been invoiced. I can't seem to make that happen. I have tried setting the allowEdit property on the data source to true, and I have enabled the controls. I have tried this in the active method for both the sales line and our custom data source, but neither has worked.
Where in the framework would I need to do this for it to work? Or is it not possible?