Hi PaulJL,
Sounds like something to do with a value being in the wrong form...what type of data is the field that's giving you problems (number, text, yes/no etc.), what type of values are in the field, and what is unique about the records that you can't import in that field, if you can tell?
From what are you importing the data (Access table, AS400, Excel table etc)?
Are you trying to import into Access?
Are there queries or forms in place that refer to this imported data?
Hopefully we can help with a little more info...