Confusing post. No idea what this means: The fieeld in the backend table >A99.99aa How can anything be greater or less than A99.99?
This too: But I can't seelect the efield from a combox bo in my front end GUI
If you can add 8 characters in the table field directly, but cannot through your form, then something about your form is padding the value in the control for this field, or is adding additional characters. I don't get what selecting a value from a combo box list has to do with entering characters and exceeding the limit - unless you're saying that you get the error when you choose a value from the combo list, in which case, typing/entering data shouldn't come into play.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.