FEB_BSPROC_POST_VB2 is a standard SAP function module that performs functionality. This is available within standard R/3 SAP systems depending on version and release level.
Below are the pattern details for this FM showing its interface including any import, export and tables parameters. There is also a list of Exceptions and for your convenience any standard documentation available. All this information and more can also be viewed if you enter the function module name FEB_BSPROC_POST_VB2 into the relevant SAP transaction such as SE37 or SE80.
CALL FUNCTION 'FEB_BSPROC_POST_VB2' "
EXPORTING
i_kukey = " kukey_eb
i_esnum = " esnum_eb
* i_mode = 'E' " char1
. " FEB_BSPROC_POST_VB2