>>The RecordSource is a table, and I am doing the SetFocus from within the StartEdit method. I think where I may be getting into trouble is the fact that the Call Stack starts with the grid txtBox.Valid and then the method gets called under that.
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>Try moving the all the Valid code to the Lostfocus instead, for now, see if that helps it.

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Bruce: Thanks. Moving code to LostFocus helped -- no more error condition. Now I'm getting real close to the form behaving as I want it to. One more little anomaly: When the grid gets the Focus, the txtBox.LostFocus fires again, and the cursor gets advanced to the next field to the right. If I could just get rid of this behavior, it would be as it should. That is, the cursor positioned on the 1st txtBox, awaiting corrected input from the user. TIA.