Forms & Subforms

I would like to create production sheets for our manufacturing. So I have
created the following tables:

1.) Table with Name of Assemby & Picture
2.) Table with Tool Name & Picture
3.) Table with Part name & Picture
4.) The main table with Name of Assembly, Tool Name, Part Name, and Task

So the idea is to create on main form that has:

Table of Assembly & Picture from table 1

And One subform with a list of tasks from table 4

The problem is that I also want to include in that list of tasks the picture
of the tool from table 2 and the picture of the part from table 3.

When I do it it seems pretty straightforward. I have created all
relationships. I go the Wizard, select the fiels that I want and ask it to
sort by Assembly & Picture.

It looks great, but every time I am up dating I receive a message error,
that the record cannot be updated or to save the record before up date it.

Would anyone help me?

Thanks,

Paulo