Problems adding syncing fields to an existing file with FM3 (probably OT)

[Alberto]

Im adding the GUID Ts Sts and DTS fields and keys to an existing file following the docs rules and using Fm3 to upgrade the file.
FM3 throus an error, see pic, its in spanish but it says:

"The string or binary data will be truncated"

If I click "No" the fields and the keys are created ok.
The GUID field has its SetIfNew option to Glo:st.MakeGuid() but its null.
The Datetime fields has its option set to 1 but they are null too.
The Fm3 is running in a totally separated exe which has NT, St and NTsyncfields
 
Of cource I could  lately fill the guid and ts fields but I dont like this error message because it will be prompted to the user and dont know how to avoid it.

May be OT, so Im posting it to the news group, but may be somebody had the same issue.

Thanks