function CF_Formula return Char is
abc varchar2(30);
begin
abc := null;

begin
If :FLAG = 'Y' then 
Insert into XXC_HHH
( CF_A10 ) 
values 
(0, -- :CF_A10 , 
,abc 
); 
end if;
end; 
return null;
end;

In that code 

If I output 0 directly, it runs (ie. 0, -- :CF_A10 ,)

If I return 0 and try to output :CF_A10 , I get the Internal error
message....
I am getting MSG-05000: DEBUG: Before Parm Trigger 
MSG-05000: DEBUG: After Parm Trigger 
REP-0069: Internal error
REP-57054: In-process job terminated:Terminated with error:
REP-271504897:
error's in the Oracle Apps Reports

function BeforePForm return boolean is
begin
srw.message (5000, 'DEBUG: Before Parm Trigger '); 
SRW.DO_SQL('TRUNCATE TABLE XXC_ABC'); 
SRW.DO_SQL('TRUNCATE TABLE XXC_CCC'); 
SRW.DO_SQL('TRUNCATE TABLE XXC_DDD'); 
commit;
RETURN(TRUE); 
END; 

function AfterPForm return boolean is
begin
srw.message (5000, 'DEBUG: After Parm Trigger '); 
If :FLAG= 'Y' then 
SRW.DO_SQL('TRUNCATE TABLE XXC_HHH'); 
commit;
end if; 
return (TRUE);
end;

nvl(:CF_A10,0), 

function CF_Formula return Char is
abc varchar2(30);
begin
abc := null;

begin
If :FLAG = 'Y' then 
Insert into XXC_HHH
(CF_A10 ,
ATTR1, --->This one
) 
values 
(0, -- :CF_A10 , 
,abc 
); 
end if;
end; 
return null;
end;

function CF_A10  return Number is
  v_qty number(10);
  
begin

 v_qty := 0;

  If :CF_Qty10 = 0 and :CF_AA <=  1 then        
     return nvl(v_qty, 0); 	
  end if;  
 
 If :CF_B10 < 0 then
 	  If nvl(:CF_Qty10,0) = 0 and nvl(:cf_Lot,0) = 0 then  
 	     v_qty := abs(:CF_B10);
 	     return nvl(v_qty, 0);
 	  end if;
 
 	     v_qty := nvl(:CF_Qty10,0);
 	  
 	     If v_qty >= abs(:CF_B10) then 
 	     	  return nvl(v_qty, 0);
 	     end if;	   
 	     
 	     If nvl(:cf_Lot,0) > 0 then
 	        Loop
              v_qty := v_qty + nvl(:cf_Lot,0);
          exit when v_qty >= abs(:CF_B10);
   	      end loop; 
 	        return nvl(v_qty, 0);
 	     end if;
 	     
 	     v_qty := abs(:CF_B10);
 	     return nvl(v_qty, 0); 	     

 end if;
 return nvl(v_qty, 0);
	
end;

function BeforeReport return boolean 
is
begin
 If :FLAG = 'Y' then 
Insert into XXC_HHH
(ATTR1,
.....,
.....,
..... 
) 
values 
(bbb
....
....
); 

function BeforePForm return boolean is
begin
   srw.message (5000, 'DEBUG:  Before Parm Trigger ');  
   SRW.DO_SQL('TRUNCATE TABLE emp1');  
  RETURN(TRUE); 
  SRW.MESSAGE(1000, 'Records Truncated From EMP1 Table Please check!!');  
END; 

function BeforeReport return boolean is
v_count number;
begin
  	select count(*) into v_count from emp1;
	if v_count=0 then
  SRW.MESSAGE(1000, 'No data found , Please Check !!!');
  end if;
  return (true);
end;

function BeforePForm return boolean is
begin
srw.message (5000, 'DEBUG: Before Parm Trigger '); 
SRW.DO_SQL('TRUNCATE TABLE XXC_ABC'); 
SRW.DO_SQL('TRUNCATE TABLE XXC_CCC'); 
SRW.DO_SQL('TRUNCATE TABLE XXC_DDD'); 
commit;
RETURN(TRUE); 
END; 

function AfterPForm return boolean is
begin
srw.message (5000, 'DEBUG: After Parm Trigger '); 
If :FLAG= 'Y' then 
SRW.DO_SQL('TRUNCATE TABLE XXC_HHH'); 
commit;
end if; 
return (TRUE);
end;

function BeforeReport return boolean 
is
begin
 If :FLAG = 'Y' then 
Insert into XXC_HHH
(ATTR1,
.....,
.....,
..... 
) 
values 
(bbb
....
....
); 

function CF_Formula return Char is
abc varchar2(30);
begin
abc := null;

begin
If :FLAG = 'Y' then 
Insert into XXC_HHH
(CF_A10 ,
ATTR1, --->This one
) 
values 
(0, -- :CF_A10 , 
,abc 
); 
end if;
end; 
return null;
end;

XXC_ABC table is used to display data

XXC_HHH--> truncating in the AfterPForm trigger and insert the data into the BeforeReport into the XXC_HHH

and in the CF_Formula  column insert the data into the XXC_HHH table 

CREATE TABLE XXC_HHH
(
  ORG                   NUMBER,
  ITEM                  VARCHAR2(40 BYTE),
  ITEM_DESC             VARCHAR2(50 BYTE),
  UOM                   VARCHAR2(3 BYTE),
  BB_CODE               VARCHAR2(20 BYTE),
  LEAD_TIME             NUMBER,
  CC_STOCK          NUMBER,
  MIN_ORDER_QTY         NUMBER,
  FIXED_LOT_MULTIPLIER  NUMBER,
  PLANNER_CODE          VARCHAR2(10 BYTE),
  QTY0             NUMBER,
  QTY1             NUMBER,
  QTY2             NUMBER,
  QTY3             NUMBER,
  QTY4             NUMBER,
  QTY5             NUMBER,
  QTY6             NUMBER,
  QTY7             NUMBER,
  QTY8             NUMBER,
  QTY9             NUMBER,
  QTY10            NUMBER,
  QTY99            NUMBER,
  PO_QTY0               NUMBER,
  PO_QTY1               NUMBER,
  PO_QTY2               NUMBER,
  PO_QTY3               NUMBER,
  PO_QTY4               NUMBER,
  PO_QTY5               NUMBER,
  PO_QTY6               NUMBER,
  PO_QTY7               NUMBER,
  PO_QTY8               NUMBER,
  PO_QTY9               NUMBER,
  PO_QTY10              NUMBER,
  PO_QTY99              NUMBER,
  HORIZON_QTY           NUMBER,
  CC_DATE              DATE,
  END_DATE              DATE,
  TAKE_RATE             NUMBER,
  ATTRIBUTE1            VARCHAR2(30 BYTE),
  ATTRIBUTE2            VARCHAR2(30 BYTE),
  ATTRIBUTE3            VARCHAR2(30 BYTE),
  ATTRIBUTE4            VARCHAR2(30 BYTE),
  ATTRIBUTE5            VARCHAR2(30 BYTE),
  ATTRIBUTE6            VARCHAR2(30 BYTE),
  ATTRIBUTE7            VARCHAR2(30 BYTE),
  ATTRIBUTE8            VARCHAR2(30 BYTE),
  ATTRIBUTE9            VARCHAR2(30 BYTE),
  ATTRIBUTE10           VARCHAR2(30 BYTE),
  ATTRIBUTE11           VARCHAR2(30 BYTE),
  ATTRIBUTE12           VARCHAR2(30 BYTE),
  ATTRIBUTE13           VARCHAR2(30 BYTE),
  ATTRIBUTE14           VARCHAR2(30 BYTE),
  ATTRIBUTE15           VARCHAR2(30 BYTE)
)
TABLESPACE TESTD
PCTUSED    0
PCTFREE    10
INITRANS   1
MAXTRANS   255
STORAGE    (
            INITIAL          64K
            NEXT             1M
            MINEXTENTS       1
            MAXEXTENTS       UNLIMITED
            PCTINCREASE      0
            BUFFER_POOL      DEFAULT
           )
LOGGING 
NOCOMPRESS 
NOCACHE
NOPARALLEL
MONITORING;