Hello SP Samy
Thanks for your help!
The thing is that if you open the txt file with excel, this column gets ruined, if you open it as a txt you'll see tah the item codes are fine. That is because I had previously changed the format for this column in excel, setting it to "personalized" with following mask: 00000000000000000000. The problem by setting "Number" format as you indicate is that excel do the rounding ruining the itam codes, for example 02796000010004400030 code gets converted in 2796000010004400000.
Regarding step 2, I am going to try it, but I don't really think it is gong to work, as by trying to load the last 40 lines I don´t get any error.
Thanks again and regards