*'cannot interpret data in file'*

Hi,

I am uploading an .txt flat file with Gui_upload function module and passing an internal table in this fuunction module.

but on executing it gives error 'cannot interpret data in file' .

below is strucure of my internal table : -

_______________________

TYPES : BEGIN OF t_record ,

mandt type mandt,

werks like marc-werks ,

matnr like mara-matnr ,

maktx like makt-maktx ,

labst like mard-labst ,

END OF t_record .

And here is my flat file data seperated by tab.

uk 11000 chair 10

swis 11001 table 20

__________________________

Can anyone tell me whats the problem.

Regards,