you can't assign a value to this object

[mmhouse]

I keep getting the message You can't assign a value to this object with the
options The object may be a control on a read-only form or The object may be
on a form that is open in Design view, or The value may be too large for this
field. I have checked every one of these options and I can't seem to get the
message to quit appearing. The only way that I can get it to stop appearing
is to take off the master, child links. But in order for the form to work I
need those links.

 

[Ofer]

Check the field on the Master and child Tables that you are linking, are they
the same type and size?