How to find right values for API parameters

Dear experts,

i need to update some columns on the screen “Incoming Customer Order”.

And I use this API: EXTERNAL_CUST_ORDER_LINE_API.MODIFY__(info_ , objid_, objversion_, attr_, action_)

How can I set the parameters “info” and “objid”?

What values does it expect here?

I can’t find them in the table “EXTERNAL_CUST_ORDER_LINE_TAB”