Attribute value to exit function module

Hello group,
I'm working in a sem-bps project and I have a problem with an exit function, because
I need the function module to read the value of a characteristic's attribute.
I read the standard function module UPF_VARIABLE_USER_EXIT_ATTR: it retrieves the attribute value through the import parameters ITO_ATTR TYPE  UPC_YTO_ATTR.
I put this attribute on my exit function but when I check the content of the attribute it’s always empty. Do you know how I can transmit the parameter from the exit planning function to the function module?
Any input is appreciated, thanks Andrea

Andrea, if you want to fill a variable with the characteristic's attribute of another variable look at the document "HowTo_BPS_VarOfTypeExit.pdf" (i send at your e-mail if you want). It Follows an extract in which it's filled the second variable with the characteristic's attribute of another variable: 
Source code: Attribute values
SELECT * FROM /bi0/mbps_produ INTO TABLE lt_chavl
WHERE bps_prodl = ls_varsel-low.
if sy-subrc <> 0.
MESSAGE e026(upc) WITH ls_varsel-low '0BPS_PRODL'.
attribute value not found
exit.
endif.
ls_varsel-seqno = '0000'.
ls_varsel-chanm = '0BPS_PRODU'.
LOOP AT lt_chavl INTO ls_chavl.
ls_varsel-seqno = ls_varsel-seqno + 1.
ls_varsel-low = ls_chavl-bps_produ.
APPEND ls_varsel TO eto_charsel.
ENDLOOP.
In the example above ls_varsel contains the attribute value to provide to eto_charsel (the output table in which you have the result).
I suggest you to debug your application to see how ito_attr is passed to the FM.
Hope it helps.
Fabio

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