How to update the table available in BADI method

Hi Friends,

I have to implement one badi ME_REQ_POSTED for purchase requistion, in this badi I have to read first line item and do

some check...if that check is true i need to update subsequent line item (line 20, 30, 40 or so) with purchase group and MRP controller.

In this BADI i have method POSTED, in this method parameter IM_EBAN is a table which i need to modify with my different

values for purchase group and MRP controller.

Kindly let me know how to update this table, so the changes can be reflected in purchase requistion.

Since when I tried to directly modify the table in a loop, system throw one error stating IM_EBAN can not be modified.

kindly help.

pradeep