Qualifier Line Using Not Equal Operator Ignored By Qp_Preq_Grp.price_request pkg

We have created a new modifier for Not to allow to be shipped outside the US. In header Level qualifier Context like ORDER, Qualifier Attribute like ORDER COUNTRY, Operator like 'NOT =" and Value from like "United States. It prices properly when the ship to address is US, if the addrees is not ship to US, it will give negative price with warning message, so order taker will not be able to progress the order. Everything is fine in the order entry screen.

In sales order form it works perfect as expected, whereas it is returning negative price in Qp_Preq_Grp.price_request call. Our company prices the item using this pkg to display webprice. When I did the debug all the line attribute & qualifier attribute everything looks good. I think the 'NOT =" operator is causing the issue.  Any suggestion will be greatly appreciated.