Cannot add new records to main form with 2 subforms

[Introfield]

My main form was fine when it was alone - and still fine when I added the first subform but now I've added a second subform it seems that I can't add new records to the main form.
I am able to add new records to both subforms.
Is the problem related to the second subform or has something else happened that I'm not aware of?

 

[fmasin]

Introfield,

Have you looked at the relationships of your tables. What is linking the two subforms to the main form?

Thanks and regards,

Francis