Syntax for Search Specification in Variable Sources when using Business Object as Source Type

Hello All.

I am working on the following Service Request where customer has a question about Syntax for a Search Spec for the Variable Source when using Business Object as a Source Type

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I added a new variable based on Business Object source type in a variable map exactly as explained in the bookshelf but it doesn't work.
I configured the variable as follows:

Mode: Any
Path: Admin ISS Product Definition/Internal Product - ISS Admin/Include Membership Product Flag
Source Type: Business Object
Search Spec: [Id] = {Product Id}

After that ePricer gives an error in thin client:

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Siebel