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Since your code has a ```nlapiSetFieldValue``` call,  the script is executed for each call of this API.  This is causing the infinite loop, what you can do is use the parameter ```fireFieldChange``` and set it to false.  I would also recommend that you set the ```asynchronous``` parameter to true.  The updated ```nlapiSetFieldValue``` call will look like this ```nlapiSetFieldValue('undepfunds', 'F', false, true)```