fill dropdownlist per Interface

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Hi Experts,

I'm trying to fill dropdown lists dynamically by value passing over the form interface.

(itab contains item1, item2, item3)

CALL FUNCTION fm_name

EXPORTING

/1bcdwb/docparams = fp_docparams

zw_export = wa_zexport

itab1 = itab

IMPORTING

/1bcdwb/formoutput = fp_formoutput

EXCEPTIONS

usage_error = 1

system_error = 2

internal_error = 3

OTHERS = 4.

In the form designer the itab is binded to the dropdown list. But in the generated PDF (received in my outlook) I can't open the dropdown menue. The three passed values are on top of each other in the first line of the DD and I can't open the dropdown.

I tried to open the PDF with Adobe 7.0.9. (SAPnote 834573) but the problem is the same.

What can be wrong?

I hope for some answers.

many thanks in advance!