I think Sybase introduced bigint at a later time than Uniface 8.4 was taken off support.   I just did a quick search and it was introduced in Sybase ASE 15, and I am pretty sure that the libraries used to build the driver would have been based on an older Sybase version. 

Have a look at the userdefined packing codes - IF you desperately need to use I8 - and since the driver doesn't support bigint I'd have as a fair guess that the lab will not do a backport.... Using userdefined packing codes isn't difficult - and it does provide a neat way to combine Uniface with either very OLD datatypes - or in this case, very new datatypes. I've used in the past on OpenVMS with RMS files where date fields were stored as a integer like this: 32101 - which when decoded would be the 101st day of the year based on 1970 + 32 years. In other words, April 12th, 2002. If this was accessed as an integer, we would not have been able to query the database with a Uniface date field. User defined packing codes solved this problem. Regards, Knut