Possible to Access Flex Fields in Custom Pricing Function?

Hello,

we created a custom pricing context with a custom pricing function in EBS 12.2.14.

The user value string in this case looks like this:

xxis_ipb_pricing_pkg.get_price('PO', null, po_advanced_price_pvt.g_line.order_line_id, po_advanced_price_pvt.g_line.item_id, po_advanced_price_pvt.g_line.need_by_date)

In this function we try to read custom attributes from the PO line during requisition import and release creation, however, even though we receive a valid order_line_id through the global record in po_advanced_price_pvt we are unable to access our flex field attributes because the order does not exist at this point. Running a select like the following will result in a