Seqence number in an outbound file

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Hi experts

I would like to send a sequence number in a file name and use the code below.

DATA: bla, bla, bla

selection-screen begin of block blk1 with frame title text-001.

parameters: P_FILE type string obligatory lower case.

selection-screen end of block blk1.

CALL FUNCTION 'NUMBER_GET_NEXT_SOP'

EXEPTION

nrrangenr = NUMBERRANGENUMBER

object = 'ZHR_SEQNR'

quantity = '1'

mandt = SY-MANDT

IMPORTING

number = ZSEQNR

CONCATENATE '/usr/sap/' zseqnr '_' sy-datum '.txt' into p_file.

select * from ..............

The parameters should look like /usr/sap/0000000001_20100511.txt but it looks like this /usr/sap/_20100511.txt

If i call the function modul above, further down, after i have done all the selections i get the sequence number but then it is to late, the parameter has already been set.

Anyone having any idea // Peter B