LSMW in ECC6.0 - Read Data Error

Dear SAP Gurus,
I am trying to create an LSMW in ECC6.0 for uploading GL Masters data for Chart of Account. I have got thru till "Read Data"
On Executing "Read Data" I am getting this error
"Loading from front end is not allowed for packed/hexadec. fields"
This comes up even though I had not given "Hexadecimal Lth field" but nothing works and Code Page selected is ASCII (not IBM DOS)
Please Help!
Thanks

Sorry it doesnt works. I am not in a position to understand as to why this error is coming up at first place.
While specifying the file type I am giving the parameters correctly, that is, I am not giving the Code Page as IBM DOS.
Parameters:
File Contents: Data for One Source Structure
Delimiter: Tabulator
File Structure:
     Field Names at Start of File
     AND
     File Type: Record End Marker (Text File)
Code Page: ASCII

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<a href="http://img93.imageshack.us/img93/4043/1ju0.jpg">Screen shot 1</a>
<a href="http://img167.imageshack.us/img167/3240/2rn4.jpg">Screen shot 2</a>
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AC30     I     aa     BAG     xxx5
AC31     I     bb     BAG     xxx6
AC32     I     aa     BAG     xxx7
AC33     I     bb     BAG     xxx8
AC34     I     aa     BAG     xxx9
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AC36     I     aa     BAG     xxx11
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AC38     I     aa     BAG     xxx13
AC39     I     bb     BAG     xxx14
AC40     I     aa     BAG     xxx15
AC41     I     bb     BAG     xxx16
AC42     I     aa     BAG     xxx17
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AC44     I     aa     BAG     xxx19
AC45     I     bb     BAG     xxx20
AC46     I     aa     BAG     xxx21
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AC48     I     aa     BAG     xxx23
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RESEARCH
========
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