SAP Function Module search on WSPT_
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WSPT_GET_VBELN_LAND - To get Country with Delivery document no
WSPT_POST_SHIP_DOC - PT Signature : Function Module to generate Signature
WSPT_SAVE_ISOIL - Signature PT : Generate Signature
WSPT_SHIP_CHECK_ASSIGN_XBLNR - Check and Assign XBLNR number
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