Mass Change ERS in PO + BAPI

Hi All,

I need to make mass change in lot of PO at itme detail level. I need to uncheck ERS and GR based IV check box in invoice tab.

I dont want to make use of Mass change tcode for this as it cause lot of work and chances of manual error are lot.

I have never used BAPI in LSMW but I have come accross BAPI for PO Change......I am pretty good at recording method in LSMW but I think that wont help me in this case due to the table control in PO. I have also found a tutorial on BAPI + LSMW for PO creation so I got some rough idea for it.

Can someone tell me the sturucture I should use for the BAPI in LSMW for my requirement and the points which I need to take care of. also tell me do I have to actiavte the inbound idoc processing for it.

Please guide....

Also suggest if i need to create 2 flat files for this ....like 1 for header and antoher 1 for item level.

Edited by: Sap: IN on Apr 30, 2011 2:36 PM