I want to prohibit updates to certain fields in records where users utilise combo boxes to make a selection. I've looked in the properties for each combo box and selected lock but that seems to then lock those fields for when i create new records for data entry via the form. How do i do this for limited fields where for example i wouldnt want a user to change suppliers of an identical product once i've orginally created the purchase order record?

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Reply from Alexander Hedley:

Hi Shaun,
You could hide or disable the control if there is a value in that field.
So when the Form opens check if a value exists, if so lock the field since it has already been added.