How to make a generic text field default back to zero or blank

I have a bc4j project that I'm creating. In it I have a text
field that is used to calculate a value derived from 2 values in
the current rowset with a click of a button. This table is a
many table. So after I do one calculation all is fine. However,
when I go down to the next value in the grid. The value from the
last calculation is still present, until I hit my calculation
button again. I want to know is there anyway to clear out this
value as you scroll/click down through your records in the grid.
other info: This screen I have a setup with a grid at the top
which contains multiple records and below this i have text fields
with all the data of the current record. (1 that you are sitting
on)

to add to previous. I already created a clear button that I can
manually use to clear this field. But I more or less wanted to
know if I can automate this process when moving out of the
rowset.
thanks

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