Thanks, Helen.
Post is not failing, the first record is appended normally to the
database, and I get no errors on doing it.
The problem is: after successfully inserting the first one, TIB_GRID
turns to a kind of READ_ONLY state, and it's not possible to enter
anything else in it.
If you can look at code, there's a very small test program and DB in
file's area, folder Demo Apps, Teste.zip. It must be unziped in a
folder C:\Teste
Roberto