MS Acces - select case mixing tables

I have problem with VBA code select case. Code is linked to combobox(Combo0) and event after update. In combobox there is a list of values: BHP, PPOZ, ISO. When i choose BHP, it should change source object property in subfrom(Child03) to subfrmBHP. Same with PPOZ and ISO. But for some reason, when i choose BHP it shows table from PPOZ, when i choose PPOZ it shows BHP and when i choose ISO it shows BHP. Code looks like this:

Private Sub Combo0_AfterUpdate()
Select Case ChangeCombo
    Case Combo0 = "BHP"
   Forms("frmInstrukcje").Form.Child3.SourceObject = "subfrmBHP"
    Case Combo0 = "PPOŻ"
    Forms("frmInstrukcje").Form.Child3.SourceObject = "subfrmPPOZ"
    Case Combo0 = "ISO"
   Forms("frmInstrukcje").Form.Child3.SourceObject = "subfrmISO"
    
End Select
End Sub

I aleredy recreated tables, form, sub form. Someone suggested me it could be data binding in subform, but there is nothing written there.

Solution

Your method references two controls, ChangeCombo and Combo0. Not sure if it's a typo or you have something else in mind.

Anyway, Case Combo0 = "BHP" is incorrect, so assuming Combo0 is the correct control, try the below.

Private Sub Combo0_AfterUpdate()
    With Forms("frmInstrukcje").Form.Child3
        Select Case Me.Combo0.Value
            Case "BHP":
               .SourceObject = "subfrmBHP"

            Case "PPOŻ":
                .SourceObject = "subfrmPPOZ"

            Case "ISO":
                .SourceObject = "subfrmISO"
        End Select
    End With
End Sub