Need urgent help how show my placeholder column in my report

hi master
sir
i use report 6i
i am making report with useing emp table i report i need one formula column and one placeholder column i
first i mad report by useing report wizard
after this i go in data modul and select one placeholder column and one formula column i write pl/sql
:cp_1 := :sal;
again run wizard and move
placeholder column and one formula column
in display item
but when i run the report give me this error
rep-1517 column 'cf_1' reffrence column 'sal' which is incompatible frequency
please give me idea how i print my formula result in report
thanking you
aamir
how show placeholder column in my report

Hi,
First create a formula column eg CF_1.
Then create a placeholder column eg CP_1.
Write a code in CF_1.
[eg
select bolFrValid into :CP_1 from tablename where condition;
return :CP_1;
Hope u got it

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