Document Splitting

Hi Gurus,

I have a quiry,i did all settings for document splitting. i choice profitcenter as mandatary field in Define Document Splitting Characteristics for General Ledger Accounting. when i am posting the invoice i am getting an error message as Balancing field "Profit Center" in line item 001 not filled that is for vendor profit center is not mention. Can you tell me what could be the reasign for this and pls solve this ASAP.

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thanks

Murali