smacdonald2008 Thanks!I got this resolved.  I chanced the event from Calculate to exit.  The script works well!form1.MileageLogSubform.Table3.Row3[0].End::exit - (JavaScript, client)if (this.rawValue < Begin.rawValue){app.alert("Error! You need to enter valid Ending");}Where can I find the definitio...

I added the if statement into filed end as following. ( add error check to the end summary filed may be complicated )Instead , I add the error check to the data entry filed. same logical , end > begin.  so if end value is < begin , error message shows. The script is at following:form1.MileageLogSubf...

Hi, I am Helen , new for the community. I am seeking for help for form designing XML\JavaScript debug skills.

and how to switch language code from formcalc to java Script?