i created a form with a subform. when i try to enter data into one of the combo boxes, which contains valuves from a lookup column, an error message stating you can not add record or delete record because a related table (202tble) is required.

does this have to do with the relationships or the table (202tble) itself?

It has to do with the relationship. Make sure that the master/child links for the subform are correct. That could be causing the problem.

i tried that solution but didnt work. are these master/ child link field properties found in at tables or form objects? do i type in the fields or do i should i see a drop box, something similar to the expressions builder, to pick my field to link.

The master/child links are properties of the subform or subreport control. If they are not filled in, you can choose from the dropdown or type the field names in yourself.