Field cannot be updated. (Error 3164)

A

Ace9x

Getting the above message when attempting to use a combo box selection in a
subform when creating a new record. Only occurs on the 1st time selection,
once I press ok it populates the value ok.
I have checked the underlying subform SQL and can use that ok. The subform
locks
and properties are all ok.I have an On change event which populates several
other unbound fields once the OK message is dismissed correctly.
Any clues as to why it should occur, and more importantly how I
remove/correct the problem.

Cheers,
Steve
 
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