InsertRecord Statement fails without error message

[hemmingway]

Environment: XE6, MySQL
I try to add an entry to a mysql table with InsertRecord.
Nothing happens. No error message. No entry in the monitor logfile.
Adding a new line in a TDBGrid connected to the same table works.
I see the insert statement in the monitor logfile.
What is the reason? Empty RowBuffers?

Greetings, Bernhard

[hemmingway]

Sorry, my mistake.

InsertRecord is not a procedure of TZAbstractRODataset.
This can without Delphi XE6 sources not work.

Greetings, Bernhard