How to pass Sales Credit (sales person) to AR DFF

**** all, Now i am trying to pass Salse person (sales order hedaer > sales credit > sales person*) to AR DFF. do you have any idea or solution to fill the requirement? I succeeded passing sales order EFF to AR DFF by using Service mapping. i have assumption that sales person info can be defaulted into sales order EFF by programming Order Extension script but it may be complicated.

if you have any idea or solution including Order extension method, could you give us some tips or solution.

*table : DOO_SALES_CREDITS, column : SALESPERSON_ID

thanks and regads,