How can I modify the net price decimal places in 2LIS_02_ITM

Question: I need to modify the extract structure for 2LIS_02_ITM; specifically, I want to change net price from 2 decimal places to 4 decimal places. I thought I could use LBWE, and select InfoSource maintenance, and then double click on the extract structure MC02M_0ITM. However, I get "function code cannot be selected". I have deactivated the extract structure thinking that would allow me access but again I received the same error. Do I need to delete the data in the set up tables for application '02' Purchasing? Am I going about this incorrectly?
I've searched the site, too, but haven't found anything pertinent.
Thanks!!
Mary

Answer:
IF your way of doing things is correct, you will have to first empty the setup tables AND the queue tables, but I have to admit that I am not even sure that you can decide to change this structure like this (and I don't have a system right now to check the feasibility of this).

Ch
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those who understand binary and those who don't.

Answer:
As Far as i know you need to write an user exit for this
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