Migrating Blankets ---> autocreate sourcing rules

Hello,

I'm using po_headers_interface and po_lines_interface to import Blankets.

I would like to create Sourcing Rules - Asign Sorurcing Rules & ASLs too, so in po_headers_interface i set LOAD_SOURCING_RULES_FLAG=Y.

Result: SR, SR Assigment and ASLs are created. eBS create a diferent Sourcing Rule for each item (and they are in the same blanket, same supplier).

MY GOAL:

I would like to assign the same Sourcing Rule for all the item of my blanket number.

I tried to use the field available in the PO_LINES_INTERFACE: sourcing_rule_name, but if I use it, Sourcing Rule is not created, neither th Assigment.