subforms question

A

Alex

currently have a subform on a tab control I am trying to
validate via a macro however when i enter the expression
for validating fields within my subform on my tab control
I get a message unable to find said form.

Should i reference the tab page aswell?

i.e

[Forms]![Training]![TTrainingLinks subform1].[Form]!
[Mandatory]=True And [Forms]![Training]![TTrainingLinks
subform1].[Form]![DateQualified] Is Null
 
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