OPEN PO LSMW

Gurus,

I have created a LSMW for open PO,with

Object 0085 Purchase Order

Method 0001 Purchase order

Program Name RM06EEI0

When i try to specify files,I am getting a error stating

No logical path specified.

I clicked on convrted data & try to assign the logical path & file from file valuedisplayed.till iam getting the same error.

*What should be done.*

I have searched thro forums not able to get a solution.