Purchase Order lines Nominal code via API

Hi,

Against a purchase order line you can assign a cost centre.

I can't see this in the Pop_order_line_views API endpoint and cannot see a way of linking to other endpoints to retrieve it.

i can go from Pop_order_line_views.pop_order_line_analysis_code_1 to Nominal_transaction_analysis_codes.Trans Analysis

but that doesn't get me to the cost centre.

Does anybody know how i can get this data?

thanks

Gareth