MECP_CHECK_KBLNR_KBLPOS is a standard SAP function module available within R/3 SAP systems depending on your version and release level. Below are the pattern details for this FM showing its interface including any import, export parameters etc and for your convenience any standard documentation available. All this information and more can be viewed if you enter the function module name MECP_CHECK_KBLNR_KBLPOS into the relevant SAP transaction such as SE37 or SE80.
CALL FUNCTION 'MECP_CHECK_KBLNR_KBLPOS' " EXPORTING im_ebeln = " ebeln Purchasing Document Number im_ebelp = " ebelp Item Number of Purchasing Document im_kblnr = " kblnr Document No. Earmarked Funds im_kblpos = " kblpos Document Item Earmarked Funds . " MECP_CHECK_KBLNR_KBLPOS