$PBExportHeader$f_rst_cus_bbala.srf
global type f_rst_cus_bbala from function_object
end type

forward prototypes
global function decimal f_rst_cus_bbala (long arg_accsetid, long arg_cmonth, string arg_subid, long arg_cusid)
end prototypes

global function decimal f_rst_cus_bbala (long arg_accsetid, long arg_cmonth, string arg_subid, long arg_cusid);//返回项目总帐期初数
decimal rst_cus_bbala
decimal init_cus_bala,cur_cus_bala 

  SELECT isnull(sum(uv_dept_bala.credit),0) - isnull(sum(uv_dept_bala.debit),0)
    into :cur_cus_bala
    FROM uv_dept_bala
   WHERE ( uv_dept_bala.accsetid = :arg_accsetid ) AND  
         ( uv_dept_bala.cmonth < :arg_cmonth ) AND  
			( uv_dept_bala.subid = :arg_subid ) and 
         ( uv_dept_bala.cusid = :arg_cusid )  
GROUP BY uv_dept_bala.cmonth,   
         uv_dept_bala.subid,   
         uv_dept_bala.itemid ;
			
  SELECT isnull(uv_cus_init.balance,0)
    into :init_cus_bala
    FROM uv_cus_init
   WHERE ( uv_cus_init.accsetid = :arg_accsetid ) AND 
			( uv_cus_init.subid = :arg_subid ) and 
         ( uv_cus_init.cusid = :arg_cusid )  ;
			
			
if isnull(cur_cus_bala) then cur_cus_bala=0
if isnull(init_cus_bala) then init_cus_bala=0


rst_cus_bbala=cur_cus_bala + init_cus_bala

return rst_cus_bbala
end function