BPREP_BW_CALC_READ_INITIAL 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 BPREP_BW_CALC_READ_INITIAL into the relevant SAP transaction such as SE37 or SE80.
CALL FUNCTION 'BPREP_BW_CALC_READ_INITIAL' "
EXPORTING
i_area = " upc_y_area
i_plevel = " upc_y_plevel
i_package = " upc_y_package
i_method = " upc_y_method
i_param = " upc_y_param
it_exitp = " upf_yt_exitp
ito_chasel = " upc_yto_chasel
ito_cha = " upc_yto_cha
ito_kyf = " upc_yto_kyf
IMPORTING
et_mesg = " upc_yt_mesg
eto_chas = " any table
EXCEPTIONS
FAILED = 1 "
. " BPREP_BW_CALC_READ_INITIAL