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Error in FM 'DYNP_VaLUEs_READ'

Hi,

I am new to ABAP and i am facing the following problem,

When i enter value into p_vbeln (from f4 i am selecting vbak-vbeln into p_vbeln) and based on p_vbeln i want to generate f4 help for p_posnr, the following code not able to capture p_vbeln value, it's showing blank value (i used all the codes' available in sdn for dynp_values_read but not able to successed) Any wrong in my below code. Appreciate any help.

Parameters: p_vbeln type vbak-vbeln,

p_posnr type vbap-posnr.

write: p_vbeln.

At Selection-screen on value-request for p_posnr.

Data: Begin of help_item occurs 0,

posnr type vbap-posnr,

matnr type vbap-matnr,

arktx type vbap-arktx,

end of help_item.

Data: dynfields type table of dynpread with header line.

dynfields-fieldname = 'p_vbeln'.

append dynfields.

call function 'DYNP_VALUES_READ'

exporting

dyname = sy-cprog

dynumb = sy-dynnr

translate_to_upper = 'X'

Tables

dynpfields = dynfields

Exceptions

invalid_abapworkarea = 1

invalid_dynprofield = 2

invalid_dynproname = 3

invalid_dynpronumber = 4

invalid_request = 5

no_fielddescription = 6

invalid_parameter = 7

undefined_error = 8

double_conversion = 9

stepl_not_found = 10

others = 11.

read table dynfields with key fieldname = 'p_vbeln'.

p_vbeln = dynfields-fieldvalue.

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