Cant use z function in enhancement

hi friends,
i created a function that work if i run it alone but when i use it in enehancement
the program go to try catch thing.
is anyone know what may be the problem?
thank in advanced,
dana.

thanks ajay fo reply,
the fm code is:
select single value into lv_value from zer_gen
where key1 = 'doc_sys' and
key2 = ''.
if sy-subrc = 0.
replace '&' in lv_value with i_doc_name.
lv_url = lv_value.
return.
else.
message......
endif.
hope u can help me,
thanks.

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