Focus of fields on form

[hkalmbach]

Hi together,

I have a form with some entry fields and a browse (procedure field).

The user wants to use the form only with the keyboard if possible.
One field is an option field. If I get to it by tab I can make one change (cursor right). After this key stroke the focus is no longer on the field. I have to use tab (one time with chrome, firexfox, several time with IE or Safari) to get back to the option field and make more changes.
I tried it with empty field 'When accepted, set focus' and also entering the field itself here. No difference.

The same I have with a lookup field if the user enters the value field manually and does not use the lookup table.

Does someone know this behaviour? What can be done?
Is the browse responsible for that?

Thanks for every help

Cheers

Heinz