Hi Phil, 
first guess is the primary key 
Add uses as far as I remember True and False as parameter for add
 and update as default parameters. 
So check the primary key of the destination table. 
Thies 


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"Phil Hassid" <philhassid@ozemailDOTcomDOTau> Wrote in message:
> Hi All,
> 
> Haven't been here for many years.
> 
> I use P8. Program containing about 750 lines of code that has worked 
> flawlessly for many years (including last 8 or so on same XP Pro computer) 
> contains a table add
> 
> tc2.add(tc1)
> 
> Both tables are first opened with an error trap (and no error ever has been 
> flagged), tc1 is emptied, then after the add both are closed and used later 
> in the program. This (update) segment of the code is only triggered 
> occasionally, where as the rest of the program is used many times a day, but 
> this occasional use of this update segment is essential to lead to valid 
> results from subsequent uses of the rest of the program.
> 
> About a year ago this tc.add suddenly stopped working. Because it was only 
> used occasionally I discovered the telling fact that immediately after 
> running the program (with the tc.add failing) the tc2 table was exactly as 
> it should be and the tc1 table was still empty but in the correct structure 
> (whereas it should be the same as the tc2 table both in structure and 
> contents) and if I simply did a manual add of the tc2 table to the tc1 table 
> I could then run the rest of the program and get correct outputs, so I have 
> used that as a workaround.
> 
> There have been no program changes, no OS/System changes, no table structure 
> changes, nothing. The sizes of the tables are small by your standards 
> (<15,000 records, although 236 fields) and have increased in size only 
> incrementally over the years. Both tables have DB, TV and FAM files only. 
> The TV file of the tc1 table did alter about a year ago but I am 90% sure 
> that that was after first discovering the problem, then going into table 
> restructure to look around, then on exiting table structure accidentally 
> accepting rather than rejecting the changed table view, so seriously doubt 
> that this is related.
> 
> Can anyone think of some generic reason this might happen? TIA
> 
> Phil 
> 
> 
> 
> 


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