Now that I remember we used to have a similar issue. It was the date format.
Hope it helps
This is our formatted txt file: Date,wo_pre,wo_suf,part_id,quantity 20170523,990101.00,1,XP600450,1
20170523,990101.00,1,XP000140,1
20170523,990101.00,1,XP011070,3
20170523,71115.00,1,CI002237,1
20170523,990101.00,1,XP011070,3
20170523,990101.00,1,XP004010,1
20170523,501103.00,1,CI002280,1
20170523,70831.00,1,CI002237,2
this is supplypro file TimeStamp
2017-05-23 08:05:04
2017-05-23 08:41:38
2017-05-23 10:41:38
2017-05-23 11:07:51
2017-05-23 11:48:54
2017-05-23 11:50:08
2017-05-23 12:47:34
2017-05-23 17:56:57
Have fun,
Kelloggs