Project and task not cascading from ATO model to option lines (status entered)

Hi,

I have a sales order in status entered, with several configured ATO models .

I used mass change to enter the project and task.

For some of the lines, it only updated the model lines. It did not cascade to option lines. While for others it updated sublines also.

Either using mass change or manually updating the info on the line, the message is: Project is not updatable when a class/option is within  ATO Model.

Could you advise why the project and task are not cascading to the option lines?

Thanks,

Regards

Andreea