change subform recordsource

[qwertyjjj]

I have a form with 5 tabs. Each tab has 2 subforms.
When the form loads I am trying to select it's recordsource by doing this:

Me!Subformname_A.RecordSource = "SELECT FieldA, FieldB FROM TableA WHERE"

However, it throws an error.
Is there something wrong with this ?

 

[RuralGuy]

Me!Subformname_A.Form.RecordSource = "SELECT FieldA, FieldB FROM TableA WHERE"