I have a column in Google Spreadsheet that calls an outside webservice using URLFetch in a Google Script. The cell uses two parameters in that cell's row. After a change occurs where those two parameters will return a different value if sent to the webservice again the cell retains a cached value. I know it is cached because if I copy and paste the row to another row, the webservice calculated values change to the correct ones.
Is there a way to force a row or a cell in a Google Spreadsheet to recalculate its value, especially if it is using an outside webservice in a custom fucntion?