Need help with product configuration

Hi

i have a task wherein i will make a attribute or a tab invisible conditionally.

ive tried dynamichide but cant seem to get it to work. im currently testing this in validate? or do i need to reelase the product?

im using siebel 7.8

-PARENT_PRODUCT

-->ATTRIBUTE:1

--->Name

---->Select Option

---->Momo

---->Janelle

-->Relationships: 1

---> RealtedProduct1

---->Product1

----->Attribute: 1

------->JGG

---------->DeeDee

On the most parent product

ive placed

Name	Value
CfgUIStateModel	Y
Expr1	CfgEval($.[PARENT_PRODUCT]#1.[RelatedProduct1]#[Product1].xf[Quantity]) ='1'

on the attribute value Momo

Name	Value
DynamicHide Expr1	Y