Hi Jamie MacCuish Thanks for your reply. My requirement is to do availability check and update an existing sale order at item level as you said if I am omitting the DOC_NUMBER in OREDER_HEADER_IN then how the sytem will understand it is an existing sale order. In my case sale order and its item(s) will already exist in the SAP system and availability check need to be happen for particular Line Item. Thanks, Shanmuga
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