Help on P.Req Enhancement

Hi...Everyone,
     i have a problem in Purchase Requisition Enhancement.The problem is When i create a p.Req with some items, then i went into that one in change mode.i was trying to add a copy of items into that one. According to the requierment if the asset no is same it will trigger a message. It's working fine if i was in the same screen in item detail.But when i was in different item detail screen,it's not showing error and the screen going to display mode but i want to display the item detail screen where the error was. where and in which exit i have to write the to handle this error.
Avinash

Hi Avinash,
  Use Userexit EXIT_SAPLMEREQ_005.
in CMOD,extend the MEREQ001 project & use the above exit.

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