Prevent data entry in subform if no records in parent form

[Jerry Maiapu]

Can please someone help me out. I am a beginner (of VB)
I have a main form with a sub form created based on two tables having one to many relationships.
i want to prompt the users a message preventing them from entering records in the sub form if the parent form has no records at all. How can i do that
Thanks alot

Jerry Maiapu

[nico5038]

When you accept the proposed linkage field when placing a subform with the wizard, then there will be no problem with adding "child records" under a "Master" record, as Access will prevent this automatically.

Nic;o)

[Jerry Maiapu]

Thanks. I got help from office online as well

[TheSmileyCoder]

Hi Nico
To make it work like that you would need to set the Foreign Key field to be a required field (Which is a good idea anywho). Atleast this goes in Access 2003. Without the required field i get no error message when adding something to a subform, without adding something to main form first.

There may be a more elegant solution but what I can think of right now is simply to add to the form_Current event:

Me.frm_Sub.Enabled = Not Me.NewRecord

And then probably add the same code to Forms AfterUpdate