BRF standard expression 0B_SC_PRCAT_EX_CHECK

Hello experts,

We are into SRM 7.0 and using BRF in workflow.

I know standard expression 0B_SC_PRCAT_EX_CHECK would check the category.

I would like to know how to write this expression so that it would return me category from shopping cart ?

Earler I have written customized z expression but I want to use standard expression to achieve this. Not able to figure it out exactly what should be inputs/parameters for this ? Please advise/suggest.

Exactly I want to check category from shopping cart that's why my approach was;

IF( Checks Whether Specified Product Category Exists, , )

I am not too sure whether it is correct or not. Does anyone know how to write expression using standard one ?

Thank you in advance.

Best regards.