End Activity Current Qty not clearing

Hi all,
I’m trying to use a scale via USB to send qty when ending activity. The scale is just sending a number based on weight. When a user clicks the Current field it highlights to 0 in that field but when the data is sent from the scale it doesn’t clear the zero but instead keeps the 0 at the end of the number.
I’ve created an MES customization layer and added an event before MESControl.EndActivity. This all works fine as I see my customization layers.

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I added a text field for a sanity check as I am unable to Auto Focus on the Current (LaborDtl.LaborQty) field. I can set Auto Focus on the text field and it works unless I bind it to the LaborDtl.LaborQty Field.

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Once I bind it, it reacts the same as the Current field and won’t Auto Focus. The end goal is land on that field and clear it…but alas my efforts have failed.
Thank you in advance for any help.